These strange objects could explain how water arrived on Earth, but may also be a previously unrecognised threat to our ...

Dark energy says: you can't have a true vacuum. Seemingly empty space actually has natural energy, and it wants to get out. It expands -- and if it's already expanding, that expansion accelerates.

Here’s how it works. An artist's impression of a dark comet in the outer solar system. (Image credit: NASA/JPL-Caltech) 2025 could be a record-breaking year in terms of discovering new dark comets.

What can galaxies smaller than our Milky Way Galaxy teach scientists about dark matter, which remains one of the most ...