1) Red shift seen in all distant galaxies, whose size is propotional to the galaxy's distance from us.
2) Existence, isotropy, and spectrum of the cosmic microwave background radiation.
Researchers found the "cosmic microwave background radiation", which is a heat imprint left over from the big bang. The redshift of light emitted by most galaxies indicates the universe is expanding.
It is unsure because when the big bang explode, space's dimension is expanding, which means the dimension will go on forever.
It is quite clear, from observations, that the Universe is expanding, and that it started from a very hot and very dense start, currently called the "Big Bang". It is not quite clear where the energy came from; there are several speculations about this, but there is not much evidence about what happened before the Big Bang - or whether there even was a "before".
The Theory of Relativity was created by Einstein, not by Eisenstein. Comment: The most obvious thing is that Einstein's equations predicted that the Universe was not "static". So a "Big Bang", expanding Universe fits the theory.
In the beginning there was nothing then the big bang happened. The universe expanded at an incredible rate before beginning to cool down. Then matter formed. Eventually the expansion will stop and the combined gravity of the universe will draw the universe back to nothing causing it to "shrink". Although this is one theory there is another that says the universe will never stop expanding due to a substance called dark matter (the opposite of gravity) pushing it ever outwards.
It is not so much that the universe is expanding, but rather the rationalization for its expansion that provides evidence to support the Big Bang Theory. The Big Bang supports interpreted observational evidence of the Cosmic Microwave Background Radiation (CMBR) barrier that there is an evolutionary expansion of the universe which promotes a finite age for the universe.
The main evidence for the Big Bang theory includes the discovery of the cosmic microwave background radiation, the abundance of light elements in the universe, and the redshift of galaxies indicating an expanding universe. These pieces of evidence support the idea that the universe originated from a hot and dense state around 13.8 billion years ago.
The universe is expanding because of force of big bang.
The discovery of the expanding universe led to the development of the Big Bang theory, which proposes that the universe originated from a singular event about 13.8 billion years ago. This theory is supported by various pieces of evidence, such as the cosmic microwave background radiation and the observed redshift of distant galaxies.
It is not so much that the universe is expanding, but rather the rationalization for its expansion that provides evidence to support the Big Bang Theory. The Big Bang supports interpreted observational evidence of the Cosmic Microwave Background Radiation (CMBR) barrier that there is an evolutionary expansion of the universe which promotes a finite age for the universe.
The three main pieces of evidence supporting the Big Bang theory are the cosmic microwave background radiation, the abundance of light elements in the universe, and the redshift of galaxies.
We know the universe is expanding because we can measure the redshift of distant galaxies. This redshift indicates that galaxies are moving away from us, and the further away a galaxy is, the faster it is moving away. This observation supports the idea of an expanding universe.
the expanding universe
No, there is evidence that the universe is expanding, because we have observed red shift in many outer solar systems. If the universe is expanding, it must have started at a point of singularity, and expanded from there. Also, we can detect radiation from the very beginning of expansion.
The theory of an expanding universe, known as the Big Bang theory, best matches the experimental evidence found by astronomers and physicists. Evidence such as the cosmic microwave background radiation and the redshift of distant galaxies support the idea that the universe began as a singularity and has been expanding ever since.
It is not exactly expanding into anything. The galaxies are moving apart from each other, from which we can infer that the universe is expanding. Theoretically, this is a result of the Big Bang, in which the universe began when all matter was compacted into a very tiny sum, and then exploded apart in a very big bang, and as a result is still expanding today.
Theories explain evidence. There is considerable evidence our universe is expanding. The primary evidence is the red shift of the light from distant galaxies. The further a galaxy is from our local group, the more the light is shifted towards the infrared end of the spectrum. The theory of General Relativity also predicts our universe should be expanding.