New simulations suggest that up to four of the solar system's rocky planets, including Earth and a long-lost world, once ...

Jupiter and Venus, the two brightest planets in our solar system, should be widely visible for much of August in the northern ...

Astronomers have discovered a new world circling the outer edges of our solar system. So far, there are only four known ...

The knock-on changes from a super-Earth – dubbed Phaeton by the researchers – were intriguing. "If it's one or two Earth masses, which is still a pretty big planet, our inner Solar System ...

Lava planets don’t play by the rules of our solar system. These scorching-hot worlds, some no bigger than Earth, orbit so ...

Osiris, a gas giant about 150 light-years from Earth, orbits a yellow star similar to our sun. It is the only planet outside our solar system known to have an atmosphere.

"This hypothetical Neptune-sized planet would circle our Sun on a highly elongated path, far beyond Pluto. It could have a mass about 5 to 10 times that of Earth and orbit about 20 to 30 times ...

The find is similar to another solar system called Trappist-1, which contains seven Earth-sized rocky planets locked in various orbital resonances. What makes the new system different is that the ...

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

NASA has announced the discovery of a new planet outside our solar system that it describes as the "closest twin" to Earth found to date. Kepler 452b, discovered using the planet-hunting Kepler ...