It’s a powerful technique, but small uncertainties at each step can add up, something critics argue may be behind the Hubble ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

Neutrinos – you may have heard of them referred to as "ghost particles" – pass through everything because they are extremely ...

Physicists tested light speed using cosmic gamma-ray bursts. Study confirms Einstein's prediction that all light colors travel at same speed.