But new studies suggest that one of his most famous ideas, the cosmological constant, may not be fixed after all. If true, it could mean the universe is destined to collapse rather than expand forever ...

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be ...

In the late 1990s, two rival teams of astronomers discovered that the universe was expanding faster and faster. It was a stunning conclusion based on the dimming light of distant supernovae. This led ...

An artistic illustration of the mechanism proposed by Professor Stefano Profumo where quantum effects near the rapidly expanding cosmic horizon after the Big Bang gravitationally generate dark matter ...