Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

Astronomers have discovered over 100 new alien worlds so far this year — some many light-years away from Earth — that ...

Detecting exoplanets is one thing, but imaging them is another thing entirely. Astronomers can detect them by the way they ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

There could be a ninth planet in our Solar System after all — and no, it’s not Pluto. Instead, it’s the theoretical Planet X, also called Planet Nine, a wide-orbit planet that would circle the Sun ...

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.. Then the planets began to emerge, as the billions of particles ...

Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to ...

This "lost" planet could have been tossed into deep space during the early chaotic days of our solar system when massive planets were still shifting around.

For years, astronomers have been searching for a ninth planet in our solar system (after giving Pluto the old heave-ho and demoting it to a dwarf planet) and now researchers say they’ve found a ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, researchers say. ABC News. Video. Live. Shows. Shop. Log In. Stream on.

Our solar system is made up of the Sun, eight planets, five officially named dwarf planets, hundreds of moons, and thousands of asteroids and comets. It sits in our galaxy which is called the ...