At the end of a lecture on astronomy, describing how the planets orbit the Sun, a little old lady at the back of the room ...

In everyday conversation, and even on our site, we treat the terms mass and weight like synonyms. But scientifically, the two are related but very separate. The mass of an object is an intrinsic ...

A new study argues that dark matter and dark energy might be illusions caused by the universe’s forces fading over time. For ...

A team of astronomers have found a mysterious object in the distant universe that could be dark matter or an inactive smaller ...