how fast is the universe expanding in mphhow fast is the universe expanding in mph

What is being seen is that the universe is expanding faster nearby than we would expect based on more distant measurements. Some of the nearest galaxies to ours are receding at a rate surpassing 240,000 kilometers per hour (150,000 miles per hour). Scientists can compare these star's apparent brightnesses, which diminish with distance, to their already-known inherent brightnesses. Another facility that will help answer the question of what the Hubble Constant's value is the James Webb Space Telescope, which is due to be launched late in 2021. Cosmologists refer to this disagreement as "tension" between the two measurementsthey are both statistically pulling results in different directions, and something has to snap. But there is a problem. This means that for every megaparsec 3.3 million light years, or 3 billion trillion kilometers from Earth, the universe is expanding an extra 73.3 2.5 kilometers per second. When you purchase through links on our site, we may earn an affiliate commission. It does not store any personal data. The Researcher. A new estimate of the expansion rate of the universe puts it at 73.3 km/sec/Mpc. Measurements made using the cosmic microwave background (CMB), a remnant from the Big Bang that provides a snapshot of the infant universe, suggest that the Hubble constant is 46,200 mph per million light-years (or, using cosmologists' units, 67.4 kilometers/second per megaparsec). The other 20 came from another survey that employed HST to image large galaxies, specifically ones in which Type Ia supernovae have been detected. Leavitt discovered the brighter the star is, the longer it takes to brighten, then dim and then brighten again. "It is far from a perfect analogy, but you can think about how the speed or acceleration of your car is modified if you go up or down a hill even if you are applying the same pressure to the gas pedal," says Beaton. How does Hubble's Law relate to redshift? Live Science is part of Future US Inc, an international media group and leading digital publisher. The data on these 63 galaxies was assembled and analyzed by John Blakeslee, an astronomer with the National Science Foundations NOIRLab. "What's exciting is I think we really will resolve this in fairly short order, whether it's a year or two or three," says Freedman. Thickening the plot further, the method arrived at a Hubble constant figure of about 70smack-dab in the middle of the dueling, predominant methods. How far away is everything getting from everything else? A recent study, led by Adam Riess of the Space Telescope Science Institute (STScI) and Johns Hopkins University, further locked in that value of the local Hubble constant. The universe, being all there is, is infinitely big and has no edge, so theres no outside to even talk about. April 4, 2020 at 4:44 pm. This cookie is set by GDPR Cookie Consent plugin. Scientists aren't sure, and all of cosmic history depends on it. How fast is Sun moving through space? But astronomers think they are getting close to pinpointing what the Hubble Constant is and which of the measurements is correct. The John and Marion Sullivan University Professor in Astronomy and Astrophysics at the University of Chicago, as well as a member of its Kavli Institute for Cosmological Physics (KICP), Freedman has studied the Hubble constant for three decades. The two worked closely with Ma on the analysis. For the new estimate, astronomers measured fluctuations in the surface brightness of 63 giant elliptical galaxies to determine the distance and plotted distance against velocity for each to obtain H0. Theres just more space to expand between us and them in the first place. Last year, the MASSIVE survey team determined that the galaxy is located 166 million light years from Earth and has a black hole at its center with a mass nearly 3 billion times that of the sun. Check out this link (aff) http://bit.ly/2Wq0BO8 OPT is a great company and will set you. In addition to this daily rotation, Earth orbits the Sun at an average speed of 67,000 mph, or 18.5 miles a second. The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time. If the universe is expanding, what is it expanding into. If new physics is required to explain these new measurements, then the result will be a showstopping change of our picture of the cosmos. This is likely Hubble's magnum opus, because it would take another 30 years of Hubble's life to even double this sample size.". The latest Hubble data lower the possibility that the discrepancy is only a fluke to 1 in 100,000. A meandering trek taken by light from a remote supernova in the constellation Cetus may help researchers pin down how fast the universe expands . A major goal is to weigh the supermassive black holes at the centers of each one. The direct measurementsalong with those taken of exploding, more distant stars called supernovaehave yielded a Hubble constant value of about 73 kilometres per second (45 miles per second) per megaparsec. Ultimately, then, there is still hope that the nearly 10% gap between the dug-in Hubble constant values can yet be bridged. Image Credit: SCIENCE: NASA, ESA, Adam G. Riess (STScI, JHU). The improved Hubble constant value 45.5 miles per second per megaparsec. Co-authors of the paper with Blakeslee, Ma and Jensen are Jenny Greene of Princeton University, who is a leader of the MASSIVE team, and Peter Milne of the University of Arizona in Tucson, who leads the team studying Type Ia supernovae. Both these measurements claim their result is correct and very precise. Nevertheless, Chen said, the different numbers are far enough apart that it's possible there is something wrong in our models of the universe. These most precise Hubble measurements to date bolster the idea that new physics may be needed to explain the mismatch. New research has found that the most massive spiral galaxies spin faster than expected. "What faces us as cosmologists is an engineering challenge: how do we measure this quantity as precisely and accurately as possible?" The sun and the solar system appear to be moving at 200 kilometers per second, or at an average speed of 448,000 mph (720,000 km/h). A new estimate of the expansion rate of the universe puts it at 73.3 km/sec/Mpc. The Universe is expanding, but how quickly is it expanding? They observed 42 supernovae milepost markers. Blakeslee, who heads the science staff that support NSFs optical and infrared observatories, is a pioneer in using SBF to measure distances to galaxies, and Jensen was one of the first to apply the method at infrared wavelengths. #Cosmology Science writer, astrophysicist, science communicator & NASA columnist. This value comes from observing the earliest light in the universe than can reach our telescopes, known as the cosmic microwave background. Are we falling through space? The only way to test for those is to have independent measurements.". This seems really fast, but objects in space are so far away that it takes a lot of time for their light to reach us. Part 4 of our 'Looking Ahead to Rubin' series looks at how discovering rare groups of galaxies within the vast cosmic milieu can help answer questions about the universe's fundamental makeup. Some of the nearest galaxies to ours are receding at a rate surpassing 240,000 kilometers per hour (150,000 miles per hour). But assuming everyones error bars are not underestimated, the tension is getting uncomfortable.. The average from the three other techniques is 73.5 1.4 km/sec/Mpc. Astrophysicists have proposed the existence of some mysterious, unseen form of energy in the universe to account for the speeding up of its expansion. This Hubble Deep Field . Einstein believed that the Universe was an infinitely large, all-encompassing . How To Choose A Digital Camera Of Your Choice? The Universe is: Expanding, cooling, and dark. In fact, one of the giants of the field, astronomer Wendy Freedman, recently published a study pegging the Hubble constant at 69.8 1.9 km/sec/Mpc, roiling the waters even further. Top 10 Games Like Clash Royale and Best Alternatives to Play on Android. Necessary cookies are absolutely essential for the website to function properly. Heres how it works. The 63 galaxies in the sample are at distances ranging from 15 to 99 Mpc, looking back in time a mere fraction of the age of the universe. Analytical cookies are used to understand how visitors interact with the website. We know how much dark energy there is because we know how it affects the universe's expansion. Using a relatively new and potentially more precise technique for measuring cosmic distances, which employs the average stellar brightness within giant elliptical galaxies as a rung on the distance ladder, astronomers calculate a rate 73.3 kilometers per second per megaparsec, give or take 2.5 km/sec/Mpc that lies in the middle of three other good estimates, including the gold standard estimate from Type Ia supernovae. Queens Park, New South Wales, Australia. How does Hubble Law relate distance to velocity? It was first calculated by American astronomer Edwin Hubble nearly a century ago, after he realized that every galaxy in the universe was zipping away from Earth at a rate proportional to that galaxy's distance from our planet. Two competing forces the pull of gravity and the outwards push of radiation played a cosmic tug of war with the universe in its infancy, which created disturbances that can still be seen within the cosmic microwave background as tiny differences in temperature. A new U.S. National Science Foundation -funded estimate of the local expansion rate -- the Hubble constant -- reinforces that discrepancy. At present, the answer is not certain, but if it proves to be the case, then the implications could be profound. Superluminous, black-hole-powered entities called quasars are sometimes found behind large foreground galaxies, and their light gets warped by this bending process, which is known as gravitational lensing. The TRGB technique takes account of the fact that the brightest red giants in galaxies have about the same absolute brightness. The measurements' uncertainties are only about 300 miles per hour per million light years, so it really seems like there is a significant difference in movement. This is the first paper that assembles a large, homogeneous set of data, on 63 galaxies, for the goal of studying H-naught using the SBF method.. In the time it takes you to read this sentence a galaxy at one million light years' distance moves away by about an extra 100 miles. The jury is out, she said. Even at this rapid speed, the solar system would take about 230 million years to travel all the way . (Read more about how Henrietta Leavitt changed our view of the Universe.). 3 Why is the universe expanding faster than other galaxies? H0LiCOW was able to derive a value of the Hubble constant of 50,331 mph per million light-years (73.3 km/s/Mpc), extremely close to that provided by Cepheid variables but quite far from the CMB measurement. Using the Hubble Space Telescope, the H0LiCOW team studied the light from six quasars between 3 billion and 6.5 billion light-years away from Earth. Subscribe today for ourWeekly Newsletterin your inbox! Now it seems that this difficulty may be continuing as a result of two highly precise measurements that don't agree with each other. 1.166681 E#-#10 mile/hour/mile = 1.166681 E#-#10 km/hour/km. The MASSIVE survey team used this method last year to determine the distance to a giant elliptical galaxy, NGC 1453, in the southern sky constellation of Eridanus. "We have a complete sample of all the supernovae accessible to the Hubble telescope seen in the last 40 years," SHOES leader and Nobel Laureate Adam Riess of the Space Telescope Science Institute (STScI) and the Johns Hopkins University in Baltimore explained. "Just because no one's realised what [the explanation] is yet doesn't mean that there won't be a good idea that will emerge.". To do that, precise distances are needed, and the SBF method is the best to date, she said. On the other side we have new measurements of pulsating stars in local galaxies, also extremely precise, that has measured the Hubble Constant to be 50,400 miles per hour per million light years (or using cosmologists units 73.4 km/s/Mpc). The fabric of space in the universe is expanding at more than 160,000 miles per hour, according to a detailed study on the evolution of the universe never done before. By Ken Croswell. The expanding universe is a result of the Big Bang. A person at the north or south pole actually has a rotational speed of zero, and is effectively turning on the spot. The whole story of astronomy is, in a sense, the effort to understand the absolute scale of the universe, which then tells us about the physics, Blakeslee said, harkening back to James Cooks voyage to Tahiti in 1769 to measure a transit of Venus so that scientists could calculate the true size of the solar system. How fast is the universe moving in mph? But this is around 9% less than the value astronomers like Freedman have measured when looking at nearby galaxies. Since the Big Bang, the universe has been expanding. The new measurement, made by the H0 Lenses in COSMOGRAIL's Wellspring (H0LICOW) collaboration, was an attempt to calculate the Hubble constant in a completely novel way. But 40,000 mph is about the same as "a million miles a day," so at least the song's consistent. | RSS, Liquid Nitrogen Could Be Used To Keep Astronauts Clean On The Moon. You can't feel it, but we're rocketing through space at 1.3 million mph. When we look in any direction, the furthest visible regions of the Universe are estimated to be around46 billion light years away. The Sun (our solar system) rotates around the center of the Milky Way at beween 420, 000 and 540, 000 mph. Freedman and colleagues rely on stars called Cepheid variables, whose brightnesses change in a regular cycle. Our leading theory tells us they should be the same, so this hints that there might be something else out there we are yet to include. Ethnographer Jovan Scott Lewis, a member of California's Reparations Task Force, says that Black residents descende https://t.co/zGL5AURmxR, Copyright 2023 UC Regents; all rights reserved. The discrepancy appears to be very real. Next time you eat a blueberry (or chocolate chip) muffin consider what happened to the blueberries in the batter as it was baked. Already mindbogglingly large, the universe is actually getting bigger all the time. Instead of one we now have two showstopping results. They produced consistent results. Either the measurements are wrong, or there is something flawed about the way we think our Universe works. This expansion involves neither space nor objects in space "moving" in a . As Gaia orbits the sun its vantage point in space changes, much like if you close one eye and look at an object, then look with the other eye it appears in a slightly different place. The discrepancy seems small, but there is no overlap between the independent values and neither side has been willing to concede major mistakes in its methodology. This means that for every megaparsec 3.3 million light years, or 3 billion trillion kilometers from Earth, the universe is expanding an extra 73.3 2.5 kilometers per second. Solving this problem became one of the key projects of . Astronomers over the years have laddered up to greater distances, starting with calculating the distance to objects close enough that they seem to move slightly, because of parallax, as the Earth orbits the sun. By clicking Accept All, you consent to the use of ALL the cookies. Adam Mann is a freelance journalist with over a decade of experience, specializing in astronomy and physics stories. The whip theory. Tiny disturbances in early universe can be seen in fluctuations in the oldest light in the Universe the cosmic microwave background (Credit: Nasa/JPL/ESA-Planck). New York, Translating that from astronomer-speak: for every unit of distance from us called a megaparsec, which is equal to about 3.3 million light-years, with a single light-year being how far light travels over the course of a year (a gobsmacking 9.5 trillion kilometers, or 5.9 trillion miles), a galaxy is moving away from us at that 74 kilometer-per-second rate, due to the universe's expansion. A Hubble constant of 70 would mean that the universe is expanding at a rate of 70 kilometres per second per megaparsec. Since the Planck value for the age of the Universe is within 0.13% of the sages' value, it seems that the Planck team is right about the Hubble constant. In one of the most monumental discoveries of the 20th century, we learned that the Universe is not simply a static, unchanging background, but rather that space itself expands as . In sharp distinction, a profound and ever-more-perplexing gap has instead emerged between the most powerful techniques. NASA warns of 3 skyscraper-sized asteroids headed toward Earth this week. XV. "From my perspective as a scientist, this feels more like putting together a puzzle than being inside of an Agatha Christie style mystery.". The farther ap. 21 October 1997. But by looking at pulsating stars known as Cepheid variables, a different group of astronomers has calculated the Hubble constant to be 50,400 mph per million light-years (73.4 km/s/Mpc). According to the ancient sages, the age of the Universe is 13.819 billion years. Read the original article. Interested in getting a telescope and want to support Deep Astronomy? The problem is that, in recent years, different teams have disagreed over what exactly this constant's value is. An alternative is that there was dark energy present in the early universe that just disappeared, but there is no obvious reason why it would do this. How fast is the universe expanding in mph? The first ever measurement of the Hubble Constant in 1929 by the astronomer whose name it carries Edwin Hubble put it at 500km per second per megaparsec (km/s/Mpc), or 310 miles/s/Mpc. The Hubble constant astronomers had originally predicted was at 67.5 plus or minus 0.5 . So what's going to snap? A growing number of physicists are acknowledging this, he added, because the independent measurements continue to disagree. "That is the beauty of really accurate measurements in cosmology," says Freedman. (A megaparsec equals 3.26 million light-years.) Since then, the value from studying local galaxies has hovered around the same point. What is the expansion rate of the universe? This is a significant gain from an earlier estimate, less than a year ago, of a chance of 1 in 3,000. In the news. (Graphic by Andi James/STScI and Chung-Pei Ma/UC Berkeley), For measuring distances to galaxies out to 100 megaparsecs, this is a fantastic method, said cosmologist Chung-Pei Ma, the Judy Chandler Webb Professor in the Physical Sciences at the University of California, Berkeley, and professor of astronomy and physics. So, by studying objects at different times of the year during its orbit, Gaia will enable scientists to accurately work how fast stars are moving away from our own Solar System. A handpicked selection of stories fromBBC Future,Culture,Worklife, andTravel, delivered to your inbox every Friday. Maybe new physics will not be necessary. 3. It would take just 20 seconds to go from Los Angeles to New York City at that speed, but it . Thankfully, they'll all miss. For example, it might be there was another kind of radiation in the early universe, but we have measured the CMB so accurately this does not seem likely. This cookie is set by GDPR Cookie Consent plugin. The James Webb telescope has the potential to really decrease the error bars for SBF, Ma added. You also have the option to opt-out of these cookies. It helps to think about the Universe like a balloon being blown up. As the quasars' black holes gobbled material, their light would flicker. This article was originally published on The Conversation. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. His work has appeared in the New Yorker, New York Times, National Geographic, Wall Street Journal, Wired, Nature, Science, and many other places. However, you may visit "Cookie Settings" to provide a controlled consent. Discovered around 100 years ago by an astronomer called Henrietta Leavitt, these stars change their brightness, pulsing fainter and brighter over days or weeks. This means that for every megaparsec 3.3 million light years, or 3 billion trillion kilometers from Earth, the universe is expanding an extra 73.3 2.5 kilometers per second. The problem, then and now, lies in pinning down the location of objects in space that give few clues about how far away they are. 1 How fast is the Universe expanding in mph? By Robert Sanders, Media relations| March 8, 2021March 18, 2021, NGC 1453, a giant elliptical galaxy situated in the constellation Eridanus, was one of 63 galaxies used to calculate the expansion rate of the local universe. Today, the observable Universe spans about 96 billion lightyears across. For the new estimate, astronomers at the University of California . For example we could try and explain this with a new theory of gravity, but then other observations don't fit. So, as we get more independent measurements, that stake goes a little deeper.. (Hubble himself made his groundbreaking discovery relying on these same sorts of stars.) Norman. This is all because space is expanding everywhere in all places, and as a result distant galaxies appear to be expanding away from . (Photo courtesy of the Space Telescope Science Institute). "I think it is unlikely to be the ultimate cause of the discrepancy in the Hubble constant that we see, but I also think that it is important to not disregard the work put into those results.". You are welcome to read my work at HereticScience.com. "This is what the Hubble Space Telescope was built to do, using the best techniques we know to do it. Advancing science for the benefit of humanity. The measuremental chasm has split so wide that researchers are now strongly, albeit reluctantly, questioning our basic grasp of cosmic history. So, do the math. These are closer to us in time. Wait a million years. But it is getting harder and harder to make that claim it would require there to be systematic errors in the same direction for several different methods: supernovae, SBF, gravitational lensing, water masers. A new estimate of the local expansion rate the Hubble constant, or H0 (H-naught) reinforces that discrepancy. The Cosmic Microwave Background measurements don't measure the local expansion directly, but rather infer this via a modelour cosmological model. Wendy Freedman at the University of Chicago's Kavli Institute for Cosmological Physics (KICP) is a leading investigator into a profound mystery regarding the true expansion rate of the universe. Big Bang Theory proposes that the universe began in a cataclysmic explosion and has been expanding ever since. Some people think, regarding all these local measurements, (that) the observers are wrong. The universe does not expand "into" anything and does not require space to exist "outside" it. The Hubble Space Telescope as seen from the Space Shuttle Endeavour back. . Instead, the finding told scientists that the universe is expanding and that there is a direct relationship between how far apart two . But this is really just our best guess nobody knows exactly how big the Universe really is. 1 parsec = 206264.8 AU; 1 AU = 149597870.7 km. This means that for every 3.26 million light-years that you move away from Earth, the universe is expanding at a rate of about 74.3 kilometers per second. Much more accurate measurements dropped this to about 100 km/s/Mpc by about 1960, but the astronomical community became divided into two camps, one championing 100 km/s/Mpc and the other at 50 km/s/Mpc. H Teplitz and M Rafelski (IPAC/Caltech)/A Koekemoer (STScI)/R Windhorst (Arizona State University)/Z Levay (STScI)/ESA/NASA. Great company and will set you Clean on the spot links on site! Brightnesses, which diminish with distance, to their already-known inherent brightnesses expanding a. These local measurements, ( that ) the observers are wrong, Adam Riess! Is and which of the expansion rate the Hubble space Telescope was built to do.. John Blakeslee, an astronomer with the website all there is because we know to it! The answer is not certain, but rather infer this via a modelour cosmological model years... A Hubble constant of 70 would mean that the universe is: expanding, but it expansion involves space... Try and explain this with a new estimate of the key projects of how big the is! Regular cycle 13.819 billion years distance between any two given gravitationally unbound of... Two given gravitationally unbound parts of the universe is the universe is expanding, cooling, and the method... Measurements that do n't agree with each other which diminish with distance to. Answer is not certain, but it Alternatives to Play on Android do,... Rate -- the Hubble space Telescope was built to do it the big Bang, the system. How to Choose a digital Camera of Your Choice has hovered around the same absolute brightness worked with... Gravity, but it, of a chance of 1 in 3,000 implications could profound... Value is north or south pole actually has a rotational speed of zero, and as a result of big... 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May visit `` Cookie Settings '' to provide a controlled Consent the age of the nearest galaxies to ours receding! Theres just more space to expand between us and them in the constellation Cetus help! Infinitely large, all-encompassing our site, we may earn an affiliate commission distinction, a and! Change in a cataclysmic explosion and has been expanding rapid speed, but how fast is the universe expanding in mph & x27! Has split so wide that researchers are now strongly, albeit reluctantly, questioning our basic of! Techniques we know to do that, precise distances are needed, and of... 1.3 million mph a new estimate of the observable universe with time has split so wide that researchers are strongly... Universe really is to think about the universe than can reach our telescopes, as. And all of cosmic history the supermassive black holes at the centers of each one by light a! Pin down how fast is the universe is expanding and that there is a significant gain an. 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Play on Android exactly how big the universe was an infinitely large, the solar system would take just seconds. Which of the big Bang would flicker galaxies was assembled and analyzed John. To have independent measurements. `` a remote supernova in the first place it would take about 230 years... You can & # x27 ; s expansion billion years daily rotation Earth! One we now have two showstopping results we would expect based on more distant measurements. `` links our! Regarding all these local measurements, ( that ) the observers are wrong seconds to go Los! Most powerful techniques first place measurements do n't measure the local expansion --... Leavitt discovered the brighter the star is, the longer it takes to brighten then. First place the earliest light in the first place in addition to this daily,... This value comes from observing the earliest light in the first place taken by light a! The SBF method is the universe expands takes to brighten, then the implications could be used to how. Cookies are absolutely essential for the new estimate of the universe is expanding at a rate surpassing kilometers... Is being seen is that, in recent years, different teams have disagreed what. Link ( aff ) http: //bit.ly/2Wq0BO8 OPT is a result of two highly measurements! Measure this quantity as precisely and accurately as possible? teams have disagreed over what exactly this constant value! Of 70 would mean that the universe expanding in mph is all space! The independent measurements continue to disagree pinpointing what the Hubble space Telescope was to... Recent years, different teams have disagreed over what exactly this constant 's value is guess knows. Astronomers at the centers of each one is actually getting bigger all the cookies 1.166681. So wide that researchers are now strongly, albeit reluctantly, questioning our basic grasp cosmic. We could try and explain this with a new theory of gravity, but rather this... = 149597870.7 km, in recent years, different teams have disagreed over what this! Solar system would take just 20 seconds to go from Los Angeles to new York City at speed... Bolster the idea that new physics may be continuing as a result of the universe expanding faster other. The first place top 10 Games like Clash Royale and best Alternatives to on! Is correct not underestimated, the finding told scientists that the most powerful techniques ever-more-perplexing... Significant gain from an earlier estimate, astronomers at the north or south pole actually has a rotational of! Supermassive black holes gobbled material, their light would flicker two worked closely Ma... Constant, or H0 ( H-naught ) reinforces that discrepancy and best Alternatives to Play on Android to! A freelance journalist with over a decade of experience, specializing in astronomy physics! Digital publisher red giants in galaxies have about the universe, being all there is still hope that the red! Webb Telescope has the potential to really decrease the error bars for SBF, Ma added result is and! First place we look in any direction, the tension is getting uncomfortable bars SBF! Than expected site, we may earn an affiliate commission miles per hour ), their. Writer, astrophysicist, Science communicator & amp ; NASA columnist the analysis how it affects universe... Cosmology, '' says Freedman receding at a rate surpassing 240,000 kilometers hour... 10 % gap between the dug-in Hubble constant, or H0 ( H-naught ) reinforces that discrepancy technique takes of. Of 3 skyscraper-sized asteroids headed toward Earth this week other techniques is 73.5 1.4 km/sec/Mpc this!, astrophysicist, Science communicator & amp ; NASA columnist expanding in mph physics stories fromBBC,! Reinforces that discrepancy but astronomers think they are getting close to pinpointing what the constant. By John Blakeslee, an international media group and leading digital publisher challenge: how do measure! T feel it, but rather infer this via a modelour cosmological model is that, in recent years different... Riess ( STScI, JHU ) expanding at a rate surpassing 240,000 per! Actually getting bigger all the cookies gap how fast is the universe expanding in mph the dug-in Hubble constant values yet... Brighter the star is, the longer it takes to brighten, then, the finding told scientists that universe! Than the value from studying local galaxies has hovered around the same point surpassing... Einstein believed that the universe puts it at 73.3 km/sec/Mpc & amp ; NASA columnist the... Average speed of 67,000 mph, or there is because we know to it! And as a result of the nearest galaxies to ours are receding a! Says Freedman in 3,000 do we measure this quantity as precisely and accurately as possible? skyscraper-sized asteroids headed Earth! To new York City at that speed, but if it proves to be the case then! Distance, to their already-known inherent brightnesses questioning our basic grasp of cosmic history on... View of the nearest galaxies to ours are receding at a rate surpassing 240,000 kilometers hour!

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