The spiral-shaped Whirlpool galaxy may be home to the first planet spotted outside our own Milky Way galaxy.
Finding any extraterrestrials, from advanced alien civilizations to simple microbes, would be an unmatched discovery.
Scientists can figure out a star's mass or composition pretty easily. Determining how old that star is, however, is a lot harder.
A gust of charged particles from the sun called the solar wind lights up auroras on Earth — and on other planets.
Two finger-sized pieces of stone drilled from a basalt rock are the first bits of Mars ready to be brought to Earth.
In the 15 years since Pluto lost its status as a planet, some scientists continue to use whatever definition works best for them.
The timing of flickers in the gas and dust of a black hole’s accretion disk correlates to its mass, a new study finds.
Meteor showers happen when Earth’s orbit passes through trails of debris left behind by comets or asteroids.
Jupiter’s hotter-than-expected upper atmosphere may be warmed by charged particles slamming into the air above the poles.