Ancient Mars May Have Been More Habitable Than It Looks Today Modern Mars is cold, dry, and exposed to harsh radiation. Its ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Solar dust could be influencing how the corona shines.

The video ranks the biggest cosmic threats to humanity, from rogue planets and black holes to supernovas, gamma ray bursts, ...

Last year, an interstellar traveler entered our solar system. Some speculated that it was an alien spacecraft, but it turned ...