Expansion of the Universe

Topic Page

Questions

• Why does intergalactic space expand, but not not galaxies and solar systems themselves?
• How fast in parsecs is the universe expanding?
• What is Hubble's Law?
• How do we know Hubble's Constant?
• How does Hubble Law relate distance to velocity?
• How does Hubble's Law change in an accelerating universe?
• How does Hubble's Law relate to redshift?
• How does Hubble's Law relate to the Big Bang Theory?
• If the universe is expanding, what is it expanding into?
• Will the universe explode?
• Does the universe rotate? We know that other aspects of the universe rotate or orbit around another object, but does it rotate itself?
• What causes the universe to expand?
• If the speed of light is the same whether we more or not, according to Einstein, then why do we see a redshift if the light source is moving away at great speed?
• What is the difference between a doppler redshift and a cosmological redshift?
• What is cosmological redshift?
• Is the cosmological redshift is a direct measure of the expansion of the universe?
• How does cosmological redshift relate to the expansion of the universe?
• What are the implications of Hubble's Law?
• Does the Hubble Law imply that the universe is expanding uniformly from Earth or somewhere near it?
• What is Hubble's Law? What is it used for?
• What is Hubble's Law and why is it important?
• With Hubble's Law in mind, how can we assume that the velocity of receding galaxies has always been constant?
• Why do we need the formula #v=H_oD# to measure the recessional velocity of a galaxy when instead we can just do #v=(dD)/(dT)#?
• How is Hubble's Law related to the Doppler Effect?
• Using the following graph, how would you determine approximately how fast a galaxy would be moving and if it is moving towards us or away from us in km/s if it were 1,000 Mpc from the Milky Way?
• Is Hubble's Law used to work out the recession speed of galaxies and stars?
• Using Hubble's Law, how would you determine the distance to a galaxy which is moving away at a velocity of 3,500 km/s? (Assume H = 70km/s/Mpc)
• Is your body expanding according to Hubble's Law? Is the Earth expandable?
• What is the formula for Hubble's Law?
• How does Hubble's Law explain the expansion of the universe?
• How does Hubble's Law support the Big Bang Theory?
• What is Hubble’s Law and its significance?
• What is the Hubble distance-velocity relationship?
• Why are standard candles important to astronomers trying to measure the Hubble constant?
• If some galaxies in the local group exhibit blueshift spectral lines, why aren't these blueshifts violations of the Hubble's law?
• What is a good analogy to explain Hubble's Law?
• Is the Hubble Constant the only law used to determine the age of the universe?
• How does Hubble's Law resolve Olbers Paradox?
• What is the Hubble Constant?
• What unit of measure does the Hubble constant use?
• Could the ages of globular clusters be used to place a limit on the maximum value of the Hubble constant?
• What it the current value of the Hubble constant and why is the value so important?
• What is Hubble's Law and how does it relate to Hubble's constant?
• How can the Hubble Constant vary if it is a constant?
• How is the Hubble constant converted to years?
• What is the relationship between the cosmological constant and Hubble's constant?
• What is the formula for Hubble's constant?
• How is Hubble's Constant calculated?
• How do you calculate the age of the universe using the Hubble constant?
• If the Hubble Space Telescope proved that Hubble's constant is actually half as large as it is currently believed to be, what would the implied age of the universe be in comparison to the current accepted value?
• What is Hubble's constant in light years?
• What is the explanation behind Hubble's constant?
• What is Hubble's Constant and how was it found?
• What does the Hubble constant mean?
• How is Hubble's Constant used?
• How do you solve for Hubble's constant?
• How is Hubble's Constant measured?
• How do you convert Hubble's constant?
• According to Hubble's constant how old is the universe?
• How is the Hubble constant used to estimate the age of the universe?
• How is Hubble's constant related to time?
• Can the Hubble Constant be represented in graphical form?
• What does Hubble's constant represent?
• What does Hubble's constant measure?
• What is the Hubble constant essentially a measure of?
• Why does Hubble's constant change?
• Why is Hubble's constant uncertain?
• How is the universe infinite?
• If astronomers can not see the end of the universe, how do they know it is still expanding?
• What is our universe called?
• Does the universe have an end point and if so what is beyond it?
• What proof do scientists have that the universe is expanding?
• What evidence supports the theory that the universe is expanding?
• What is the force that causes the universe to expand?
• How much does the volume of our universe increase by as it expands?
• What is the scientific name for the edge of our universe?
• What is 5 feet beyond the edge of the than the universe?
• What is on the other side of the universe? How can there be an end to the universe?
• Why is the universe transparent?
• Why is the universe thought to be infinite?
• How can the universe end?
• How can the universe exist?
• How can the universe expand?
• Is the rate at which the universe expanding slowing down, speeding up, or remaining constant?
• At what rate is the universe expanding?
• How does the expansion of the universe affect time?
• Does the expansion of the universe affect time?
• What is the temperature at the point where the universe is expanding?
• How long has the universe been expanding?
• When is the universe expected to cease expanding?
• Will the universe stop expanding?
• What will happen when the universe stops expanding?
• What is the universe composed of?
• What will happen when the universe stops expanding?
• What observational evidence supports the fact that our universe is expanding?
• What might be causing the universe to accelerate?
• Does the space taken up by matter also expand as the universe expands?
• Which scientist discovered that the equations he had derived predicted an expanding universe, then modified his equations to eliminate this expansion?
• Is it true that galaxies are moving away from us and into the vast, empty space of the outer universe beyond the Big Bang?
• Why are galaxies accelerating away from each other?
• Are the galaxies in the universe moving through space?
• Is our universe expanding? Or does it only seem bigger because our ability to look further into the universe has grown?
• If the universe is expanding, are there more structures such as galaxies, stars, etc., towards its center rather than at the newer edge?
• Is the rate of acceleration of expansion of the universe known?
• Will the universe keep on expanding forever or is there enough gravity to slow down the expansion?
• What is the effect of the expansion of the universe on light?
• Could gravity slow the expansion of the universe?
• Is it true that the expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart?
• Is rate of expansion of universe increasing?
• Will dark matter be able to stop the expansion of the universe?
• Is the expansion of the universe caused by time?
• How does dark matter relate to the expansion of the universe?
• How fast is the universe expanding in miles per hour?
• In 1998 it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang?
• When was it theorized that universe was still expanding?
• Does the expansion of the universe have any effect on time?
• Assuming that the whole universe doesn't collapse upon itself, would matter eventually lose cohesion at an atomic level and cease to exist?
• How do observations of distant supernovae show that the expansion of the Universe is accelerating?
• The Big Bang theory of the formation and expansion of the universe is supported by what observation?
• How does expansion of the universe differ from other theories about the universe?
• How did the expansion of the universe start?
• How do we know the expansion of the universe is accelerating?
• How does dark energy affect the expansion of the universe?
• How does gravity affect the expansion of the universe?
• How does the existence of dark energy affect the expansion of the universe?
• How does the expansion of the universe create redshifts?
• How fast is expansion of the universe?
• How is the expansion of the universe measured?
• How do astronomers calculate the expansion of the universe?
• How did scientists determine the speed of the expansion of the universe?
• Why do scientists measure the expansion of the universe?
• How was the expansion of the universe discovered?
• What is beyond our universe?
• When is it predicted that the universe will stop expanding?
• Is our Universe still expanding after the Big Bang?
• What propels the expansion of the universe?
• Where is the edge of our universe?
• How do astronomers know our universe is expanding?
• How will we know if the universe stops expanding?
• How big is our galaxy and how fast is the universe expanding?
• If it is physically possible to exceed the velocity in which the universe is expanding, can we move forward in time?
• How fast is the universe expanding at the farthest edge we can see?
• How fast was the universe expanding during the first second of the big bang?
• How fast is space expanding? Does the rate of expansion have any direct effect on the Earth or our galaxy?
• In km/sec, how fast is the universe expanding?
• If the solar system is expanding, how much closer would Mars be to Earth 500 million years ago?
• Is it true that the universe is expanding faster than the speed of light?
• If nothing can travel faster than light then how fast did the universe expand during the big bang?
• Is the universe expanding?
• When will the universe stop expanding?
• Why is the Universe still expanding so quickly?
• Is the universe expanding faster than the speed of light?
• Does space expand faster than light speed?
• How do we know how fast the universe is expanding?
• How fast is the observable universe expanding?
• How fast is the universe expanding in light years?
• How fast is the universe expanding in mph?
• How fast is the universe expanding per second?
• At what speed is the universe expanding?
• Why is the universe expanding so fast?
• Does the universe expand faster than the speed of light?
• How fast is our galaxy moving through space? Is the movement due to the expansion of the universe?
• Are galaxies moving faster and farther apart?
• Does the universe rotate?
• Question #76e8b
• Is space expanding within superclusters of galaxies?
• How will astronomers know when the universe stops expanding?
• Why are galaxies moving away from us?
• Does the expanding universe model mean that our Milky Way galaxy is at the center of the universe?
• What does the cosmological principle state about the universe?
• What bodies in the wider universe are moving?
• How do we know that galaxies are moving away from the center of the universe?
• What if all the galaxies are merely orbiting the center of the universe, but their orbit is so big that it seems like they're moving away?
• How do we know that galaxies farther away from us are moving faster than nearby galaxies?
• How do other galaxies move relative to earth?
• Recent results from very bright supernovae in very distant galaxies seem to indicate what about the expansion of the universe?
• What parameter of the present universe, more than any other, is considered to be critical in determining the ultimate fate of the universe?
• How is the universe expanding?
• How can the universe be expanding?
• How can the universe be expanding faster than light?
• How can the universe keep expanding?
• How can astronomers tell the universe is expanding?
• How can we determine if the universe is expanding?
• How can we prove the universe is expanding?
• How can we tell if the universe is expanding?
• How can astronomers determine that the universe is expanding?
• How do we know the universe is expanding and still accelerating?
• How do we know the universe is expanding faster?
• How do we know the universe is expanding using redshift?
• Why does the universe expand?
• What evidence shows that the universe is expanding?
• How is the universe expanding faster?
• How is the universe expanding faster than the speed of light?
• How is the universe expanding if it is infinite?
• Is the universe expanding into nothing?
• What does the universe expanding mean?
• What is the expanding universe theory?
• What is the universe expanding away from?
• Why is the universe constantly expanding?
• What is it expanding into? Will it ever stop? Will we ever be able to go outside the zone it is expanding into?
• If the universe is expanding, what is on the other side?
• If space isn't part of the Universe, what is the Universe expanding into?
• What force causes the universe to expand?
• How did the scientists determine that the Universe is expanding? What did the method consist of?
• If the universe is expanding at the speed of light and light travels at the speed of light then how are we still able to see light from the galaxies that are moving away from us?
• What is the driving force behind the expansion of space?
• Is the universe contracting?
• How fast are the furthest objects we can see moving with respect to our galaxy?
• Is the universe expanding in one direction?
• Edwin Hubble discovered the universe was expanding by measuring the light of distant stars, and by showing that those distant stars were moving further away from the earth. If this is so, then why is the Andromeda Galaxy moving closer to us?
• Why is the universe expanding? How can it do that?
• Is there a limit to how far the universe can expand?