Which hypothesis is most supported by astronomers? The universe is currently expanding and will continue to expand. Stars could burn out causing the universe to become dark and cold. Gravity could pull galaxies back together causing a reverse of the big bar Dark energy will pull the universe together to form a massive black hole.

The hypothesis that is most supported by astronomers is that the universe is currently expanding and will continue to expand. This is based on the observation of the redshift of light from distant galaxies, which indicates that the universe is expanding. Additionally, the discovery of dark energy, a mysterious force that is causing the acceleration of the universe's expansion, further supports this hypothesis.