Astronomers have discovered two neighboring planets - one a bigger version of Earth - orbiting closer to each other than any planets discovered before.
There could be many more small planets than previously thought, thanks to the discovery that they don't need to form around stars rich in heavy elements.
Solar systems with so-called hot Jupiters don't seem to harbor Earth-sized planets, a discovery that will narrow the search for Earth-like worlds.
It sounds like the plot to a science fiction story, but new scientific research hypothesizes that "advanced dinosaurs" may have evolved on other planets in the universe.
Astronomers have long searched for habitable exoplanets orbiting red dwarf stars (M dwarfs), which are considered the most common type of star in the Milky Way galaxy.
Runaway planets could be hurtling through space at up to 30 million miles an hour, torn from their suns by a black hole.
The vast majority of stars in our Milky Way galaxy have at least one planet orbiting them, astronomers have concluded - and lots of these could be comparatively Earth-like.
NASA says its discovered two Earth-sized planets that have been swallowed up by their star - and survived.
The fat, doughnut-shaped clouds of dust that surround about half of supermassive black holes could be the remnants of planets and asteroids that have smashed into each other at incredible speeds.
Astronomers have for the first time spotted a disk of gas and dust around a sun-like star that shows spiral-arm-like structures.
SpaceX CEO Elon Musk believes the human race should aspire to colonize the solar system, rather than just making do with inhabiting planet Earth.
Are we alone in the universe? Russian scientists don’t think so.
Our sun and its inner planets may not have formed from the same materials, as previously thought, samples returned by NASA’s Genesis mission indicate.
Scientists believe they've worked out why some extrasolar planets orbit in the opposite direction to their star's rotation.
Recently, NASA identified a world known as KOI 326.01. The planet is a tad smaller than Earth, with an average temperature lower than water’s boiling point. Still, in some ways KOI 326.01 is somewhat analogous to Earth, at least in size.
NASA's Kepler telescope has for the first time observed a planetary system with two planets passing in front of their star.
Stephen Hawking believes humans must colonize additional planets or face mass extinction.