In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

While these celestial events are rare, they are not impossible. The big question is: can they really influence our planet’s orbit? Let’s delve into this cosmic dance and uncover the mysteries ...

Lance Hayashida/Caltech The candidate for Planet Nine displayed a tiny amount of movement, which could mean it advanced further in its orbit around the sun. Some of the strongest evidence that ...

NEW YORK — A new Tatooine-like planet outside the solar system may orbit two failed stars, scientists reported Wednesday. Located about 120 light years away, the exoplanet appears to take an ...

They propose that one of the stars and the planet orbit the second star in two opposite directions. In other words, the planet is retrograde, or orbiting the star in reverse. "The existence of ...

The space rock will make one complete orbit of our planet between Sept. 29 and Nov. 25 before escaping Earth's gravity. Yet despite this 57-day close flyby of our planet, the asteroid will be hard ...