A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

With an atmosphere, by mass, of primarily hydrogen (76 per cent) and helium (24 per cent), and by volume of 89 per cent ...

NASA’s Asteroid Watch Dashboard has issued a new list of five asteroids on approach, with close passes to Earth expected ...

An international team of astronomers reports the discovery of a new giant exoplanet around an M-dwarf star (GEMS). The ...

A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ...

The authors suggest that—among other things—Roman could vastly improve on the existing measurements of the abundance of these types of planets smaller than Earth. It could also help ...

Here, the crust is composed of weaker, smaller pieces ... geologically active than previously believed and may help scientists understand why Earth became a habitable planet and Venus did not.

The Giant Magellan Telescope offers sharper images, efficient light use, and the ability to find Earth-like planets.

"Rings are mostly made of ice and small rocks," said William Saunders, a planetary scientist at NASA's Langley Research ...

"We must accept that the US’s unique geography and history means that it has always been more concerned with its civil ...

Astronomers have captured visible auroras dazzling the skies above Mars — and they're unlike anything we can see on Earth.