The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

According to the data, the object is situated between 46.5 billion and 65.1 billion miles from Earth — about 14 times farther ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

Kosmos 482 —originally launched on March 31, 1972, as part of the Soviet Union's ambitious Venera program to explore Venus—is ...

Using two infrared space telescopes and a 23-year gap, scientists may have spotted a mysterious, slow-moving object beyond ...

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

Have you ever noticed that rockets tend to launch from the east coast of the U.S.? There is actually a reason for that, and ...

Astronomers from MIT have uncovered a dramatic celestial spectacle: a Mercury-sized exoplanet that is rapidly disintegrating ...

In addition to the exoplanet’s polar orbit, the brown dwarf pair itself is extraordinarily rare. They form an eclipsing ...

Scientists have discovered an exoplanet 140 light-years away that's rapidly disintegrating as it orbits its star every 30 ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...