Redshift of distant galaxies, attributed to the Doppler effect; and cosmic background radiation which agrees with certain predictions of the big bang model. I suggest you read the Wikipedia article...
1) Astronomer Edwin Hubble discovered that most celestial objects were moving away from each other, due to the red-shift of the light coming from them. This means that if you go back in time, all...
The big bang theory is that our Universe began with an expansion of space (NOT an explosion of matter into space) that continues to this day at a rate that has remained fairly constant over the last...
First, all the objects in the universe are moving away from each other at a very fast pace; suggesting, that they were all, at one point, very, very, very close together. And second, antimatter.
The most commonly cited evidence is the metric expansion of space. It is inferred from Hubble's law that the Universe is expanding faster and faster with time, due in roughly equal proportions to the...