Just after World War II, when astronomy via a "spaceship" got its first concrete proposal, it sounded outlandish.
A telescope is being fine tuned to search for gravity waves. If confirmed to exist, they would reveal convincing evidence for a big cosmology theory.
There are about ten thousand billion billion habitable planets in the observable universe, and some of these Earth-like worlds could be found soon.
Scientists have discovered the source of a galaxy's two extra, ghostly spiral arms that show up only in some telescope images, cracking a 45-year-old mystery.
New study finds creatures huddle together as a survival strategy. Might Mars harbor similar organisms?
The heart of one of the Milky Way galaxy's most massive star clusters harbors as many as five pinwheels, a strange and relatively newly discovered type of stellar object, astronomers say.
New study says nothing directly about the effect of space radiation on people but it has implications for the future of human spaceflight.