Vesta, thought to be the second-largest asteroid in the solar system, could be a piece of an ancient, unknown planet, a new ...

The second-largest asteroid in the solar system is Vesta, and it may be a piece of an ancient lost planet. […] ...

Discover the order of planets in the solar system. From Mercury to Neptune ... system formed about 4.6 billion years ago from a giant rotating cloud of gas and dust known as the solar nebula.

Astronomers studied it for clues to how early planets grew, and what Earth might have looked like in its infancy.

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

Once the quirky underdog of our solar system, Pluto held planetary status until 2006 ... the time it takes for Pluto to complete one full rotation on its axis, is about 153 Earth hours or 6.4 ...

Vesta might be a shattered remnant of an early planet, not a failed one—forcing scientists to rethink how worlds begin.

The exoplanet 2M1510 (AB) b makes an unusual orbit around a pair of brown dwarfs, objects bigger than gas-giant planets but ...

For decades, scientists believed Vesta, one of the largest objects in our solar system's asteroid belt, wasn't just an asteroid and eventually concluded it was more like a planet with a crust, mantle ...