Doppler shift shows that galaxies are moving away from each other at rates that depend on how far apart they are. According to the Big Bang Theory, the universe began with an enormous explosion. Then, the entire universe began to expand everywhere at the same time.
The doppler shift shows that galaxies are moving away from each other at rates that depend on how far apart they are.
The Big Bang theory predicts an expanding universe. The red shift, being the Doppler effect of light when something is receding from you, confirms this because when looking at galaxies the light emitted from them is red shifted. The farther away galaxies have a higher red shift, confirming that all galaxies are moving away from each other, not just the Milky Way (i.e. the universe is expanding).
What is one characteristic of galaxies that requires the use of General Relativity instead of Newtonian theory?
The Big Bang theory states that the galaxies in the universe were formed almost 14 billion years ago. The Big Bang theory proves the galaxy spread out as it formed.
The Big Bang Theory
All modern models based on science that are worth their salt would be. The only major theory I know about the origin of the universe is the Big Bang Theory, which is supported by Red Shift observations. Galaxies we can observe are all moving away (we know this due to Red Shift) from a central point, believed to be the epicenter of the Big Bang.
Redshift; the generally accepted explanation for the redshift of distant galaxies is that it is cosmological redshift, caused by the expansion of the Universe. This is somewhat related to the idea of the Doppler effect.
Edwin Hubble played a crucial role in providing evidence for the Big Bang Theory by observing the redshift of galaxies. He discovered that galaxies were moving away from each other, and the farther away they were, the faster they were moving. Hubble's observations supported the idea that the universe is expanding, which is a key component of the Big Bang Theory.
You might say that. But it's probably closer to the truth to say that it worked in exactly the opposite way . . . The Big Bang theory is an attempt to explain the shift toward red in the spectra of all distant galaxies, along with many additional observational facts in Astronomy, Physics, and Cosmology.
Actually, it wasn't the Doppler-effect that lead to the Big Bang theory, but the red-shift of remote galaxies. Although it was initially thought that this red-shift might be caused by a Doppler-effect, it is now understood that this red-shift is caused by the metric expansion of space itself.
I presume the question refers to the "redshift" of distant galaxies. Actually it is the other way around - i.e. the Doppler redshift helps to support and explain the Big Bang Theory. This "redshift" is called the "cosmological redshift". Strictly speaking, it's not the Doppler effect.
Galileo Galilee
A theory can offer explanation for an observed phenomenon that is supported by extensive data.
It is called The Big Bang Theory, actually. Doppler shift shows that galaxies are moving away from each other at rates that depend on how far apart they are. According to the Big Bang Theory, the universe began with an enormous explosion. Then, the entire universe began to expand everywhere at the same time.
See "related links" for a list of some important ones. The Hubble Space Telescope alone has observed thousands, and that was just by looking at a very small patch of the sky. There are actually millions that could be observed if we had time to do it. In fact, astronomers calculate that there are hundreds of billions of galaxies. In theory many of them could be observed and the number we can see will increase as our technology improves.
The Big Bang theory predicts an expanding universe. The red shift, being the Doppler effect of light when something is receding from you, confirms this because when looking at galaxies the light emitted from them is red shifted. The farther away galaxies have a higher red shift, confirming that all galaxies are moving away from each other, not just the Milky Way (i.e. the universe is expanding).
The main evidence for the Big Bang is the expansion of the Universe, as seen from the Doppler effect. That is, light from other stars or galaxies changes color depending on the relative velocity to Earth; it turns out that all far-away galaxies are receding from us.
nebular theory