Is the Universe expanding, if so, at what rate?

Question

Is the Universe expanding, if so, at what rate?

Answer 1

This surely may come as a surprise to many, but the universe is neither expanding nor contracting, it is moving in grand layers in a circle, kind of revolution, depending on the revolution is the construction of galaxies, all that marvel on the basis "stagnation is death" so it moveth, like the restless man who moveth, for it was always there till, for completing this sentence would be in Glory..... Thanks.

Answer 2

it is expanding..idk at what rare..they use some theroy with backing rasin bread or something...it is still spreading from the big bang

Answer 3

"Before Hubble, astronomers could not decide if the universe was 10 billion or 20 billion years old," "The size scale of the universe had a range so vast that it didn't allow astronomers to confront with any certainty many of the most basic questions about the origin and eventual fate of the cosmos. After all these years, we are finally entering an era of precision cosmology. Now we can more reliably address the broader picture of the universe's origin, evolution and destiny."

The team's precise measurements are the key to learning about the universe's rate of expansion, called Hubble's constant. Measuring Hubble's constant was one of the three major goals for NASA's Hubble Space Telescope when it was launched in 1990.

For the past 70 years astronomers have sought a precise measurement of Hubble's constant, ever since astronomer Edwin Hubble realized that galaxies were rushing away from each other at a rate proportional to their distance, i.e. the farther away, the faster the recession. For many years, right up until the launch of the Hubble telescope -- the range of measured values for the expansion rate was from 50 to 100 kilometers per second per megaparsec (a megaparsec, or mpc, is 3.26 million light years).

The team measured the Hubble Constant to be 70 km/sec/mpc, with an uncertainty of 10 percent. This means that a galaxy appears to be moving 160,000 miles per hour faster for every 3.3 million light-years away from Earth.

The team used the Hubble telescope to observe 18 galaxies out to 65 million light-years. They discovered almost 800 Cepheid variable stars, a special class of pulsating star used for accurate distance measurement. Although Cepheids are rare, they provide a very reliable "standard candle" for estimating intergalactic distances. The team used the stars to calibrate many different methods for measuring distances.

Combining Hubble's constant measurement with estimates for the density of the universe, the team determined that the universe is approximately 12 billion years old -- similar to the oldest stars. This discovery clears up a nagging paradox that arose from previous age estimates. The researchers emphasize that the age estimate holds true if the universe is below the so-called 'critical density' where it is delicately balanced between expanding forever or collapsing. Alternatively, the universe is pervaded by a mysterious 'dark force' pushing the galaxies farther apart, in which case the Hubble measurements point to an even older universe.

The universe's age is calculated using the expansion rate from precise distance measurements, and the calculated age is refined based on whether the universe appears to be accelerating or decelerating, given the amount of matter observed in space. A rapid expansion rate indicates the universe did not require as much time to reach its present size, and so it is younger than if it were expanding more slowly.

Answer 4

5 to 10 percent every billion years :)

Answer 5

Hubble, who had been the first to establish that the universe included many other galaxies outside of our own, noticed something else: the galaxies were receding from us at a velocity proportional to their distance. The more distant the galaxy, the greater its redshift, and therefore the higher the velocity, a relation known as Hubble's Law.

The velocity v could be determined by multiplying the distance R by H, the Hubble constant, given by the slope of the line in the above graph, in units of kilometers per second per million light years. The Hubble constant describes the universe's rate of expansion.

Answer 6

Yes. At a rate of 10 units per time unit.

HA I answered correctly by not answering at all.

*strokes goatee*

Answer 7

it isnt wow thats a wierd question

Answer 8

71 ± 4 (km/s)/Mpc

Answer 9

dude i honestly dont know, and i dont think anyone knows, nobody even knows how big the universe is.

oh and no offence, but it doesnt affect our lives in any way, we've got loadza problems of our own on earth!

Answer 10

yes, at the speed of light.  about 186,000 miles per second!

Answer 11

88 miles per hr.

Answer 12

The scientists seem to believe so but that does not make it so.Scientists have been wrong many times in the past and they will still make mistakes in the future as long as there is human imperfection.

It is a waste of time to think about it.Get down to earth.That is where the real action is.

Most humans are still evolutionary children who think they know the truth.

Answer 13

according to Hubble constant 71 (km/s)/megaparsec it is not a speed but a ratio of a speed to distance. Hubble got the

rate of expansion by dividing velocity by distance  according to pnas they have added and expanding to the Hubble constant and dark energy may be driving the acceleration and defying gravity's pull  someone said HC 71..., is not a speed but a frequency 2.30095131x10-18hertz .  they think it is expanding

Answer 14

I guess it's not defined