The exo-planets are larger than the Earth but smaller than Neptune. The planets are in a little-understood class called sub-Neptunes, commonly found orbiting sun-like stars in the Milky Way.

The find, announced Wednesday, can help explain how solar systems across the Milky Way galaxy came to be. This one is 100 light-years away in the constellation Coma Berenices. A light-year is 5.8 ...

Planets orbiting red dwarf stars may have a harder time hanging on to the conditions needed for life to arise and survive than previously thought, data from NASA's dead space telescope GALEX reveals.

To put it another way, the four planets closest to the Sun are the youngest; the two planets farthest out, the next youngest; and the two in between, the oldest.

It has discovered 1,235 exoplanets, or planets like ours, that revolve around a sun, in an area that represents around 1/400th of the Milky Way.

A waning crescent Moon will pass close to Jupiter, Uranus, Mars and Venus, occulting Mars and Uranus. As the night sky darkens the Milky Way will become more easily visible.

Red dwarfs are the most common kind of star in the universe, so they alone could possibly explain all the low-mass ejected planets we see. Stars like the sun might eject many planets as well, but ...

The exo-planets are larger than the Earth but smaller than Neptune. The planets are in a little-understood class called sub-Neptunes, commonly found orbiting sun-like stars in the Milky Way.

The exo-planets are larger than the Earth but smaller than Neptune. The planets are in a little-understood class called sub-Neptunes, commonly found orbiting sun-like stars in the Milky Way.