Astronomers have discovered bizarre planets very different to Earth out in the galaxy, but will we ever locate a planet similar to our own?
Cosmic rays that damage human DNA are a serious risk in manned space exploration. Can physicists find the source of the rays and help reduce the danger?
Earth's past is marked by one cosmic disaster after another, forging the path of human evolution. Experts explore how close the Earth has come to destruction.
New research is beginning to reveal an invisible scaffold of dark matter known as the Cosmic Web, an intergalactic network that transformed the universe.