Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the ...

In 2006, the International Astronomical Union stopped classifying Pluto as our solar system’s ninth planet and demoted its ...

Scientists believe such an extreme orbit means the object was pushed and pulled by the gravity of giant planets like Jupiter ...

One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

A small international team of astronomers has confirmed that a binary star system with an odd signal has a companion—a planet ...

T he Solar System has just gotten a new official member. Currently, with the name of 2017 OF 201, this is a trans-Neptunian ...

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the Institute for Advanced Study's School of Natural ...

We all have a room in our minds where the past lives. Some call it memory, others call it baggage. It’s filled with faded ...

Elon Musk, under the username "Kekius Maximus," has joined William Shatner in advocating for Pluto's reclassification as a ...

From gravel-size meteoroids to mountain-size asteroids and even visitors from other star systems, space is packed with ...

William Shatner called for an end to the International Astronomical Union’s ‘tyranny of the cosmos’ as he made a planetary plea to Donald Trump ...