Evidence that the universe is expanding is best provided by the?

Answer 1

The main piece of evidence is the redshift of galaxies. In spectroscopy an absorption line that is redshifted indicates that the object is moving away. The farther the object is from the source of observance the faster that object travels in relation to the observer. Almost all galaxies are redshifted as opposed the our local neighborhood, the Andromeda Galaxy for instance is blueshifted because it is heading strait for us. at some point all galaxies will spread so far from each other that they will be going so fast that they reach the speed of light in respect to our position and are never seen again. Another piece of evidence is the fact that their is some warmth in space. Also known as the Cosmic background radiation. Empty Space is around 2.7 degrees kelvin which is the residual heat from the big bang. Had their not have been an explosion with a massive amount of heat and energy and everything simply was, then empty space would be absolute zero. This is the two strongest arguments that support the big bang theory.

Answer 2

redshift of light from distant galaxies, which indicates that they are moving away from us. This redshift is consistent with the idea that space itself is expanding, causing galaxies to move further apart from each other over time.

Answer 3

There are several pieces of evidence. The primary one would probably be the redshift of distant galaxies. This is a change in frequency in the light, and it is usually interpreted as the result of the Doppler effect - meaning that distant galaxies are systematically moving away from us. In other words, the Universe is expanding.

Answer 4

The most direct evidence is that the light from all distant galaxies have a red shift, and the degree of red shift depends on the distance between us and the distant galaxies. This is an irrefutable fact about our Universe, and can only be explained by an expanding Universe.

But there is also direct evidence that the universe was once smaller than it is now.

Answer 5

In simplest terms, it is an irrefutable fact of our Universe that the distance between us and all distant galaxies is increasing, and that the rate at which that distance is increasing depends only on the distance between us and those distant galaxies. This fact can only be explained by an expanding Universe.

Answer 6

I've heard people say that in the beginning of the universe (the big bang theory) the universe has been growing and expanding. However, some say that in the future, the universe will squish together and explode, creating a new universe...weird.

Answer 7

The redshift of distant galaxies, and the fact that the amount of the red shift depends on the distance between us and those distance galaxies. Hubble Expansion is the only explanation that fits the observations.

Answer 8

The expanding universe is a complex topic and there are thousands of excellent websites devoted to it at every level. Briefly, in 1929 the American Astronomer Edwin Hubble made observations that the light coming from certain planets in distant galaxies, in their relation to one another, was indicating an increasing distance between them. The only explanation was that the universe was expanding.
You can learn more by exploring the many websites devoted to this topic.

http://www.pbs.org/wgbh/aso/databank/entries/dp29hu.html

http://skyserver.sdss.org/dr1/en/astro/universe/universe.asphttps://imagine.gsfc.nasa.gov/educators/programs/cosmictimes/

Answer 9

The galaxies are moving away from each other.

Answer 10

The most compelling evidence is the red shift shown by galaxies.