Astronomers have long suspected that an enormous, unseen planet is hiding somewhere far beyond Neptune, quietly shaping the ...

Pluto isn’t the only dwarf planet in our solar system's outer reaches. Now is an ideal time to look for the egg-shaped Haumea ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

Scientists are using an array of instruments to detect other planets, some of which may harbor life—and others that most ...

Astronomers have discovered two new exoplanets that are similar to other worlds found in the Milky Way, but unlike any in our ...

The powerful James Webb Space Telescope has captured a series of remote planets in the HR 8799 star system that are 130 light years away in the Milky Way, and they are very strikin ...

In reality, there are hundreds, if not thousands, of natural satellites, in our cosmic neighborhood ... be considered planets in their own right. So exactly how many solar system moons have ...

a fraction of our solar system's 4.6 billion years. Still hot from their violent formation, HR 8799 planets emit large amounts of infrared light that give scientists valuable data on how their ...

a fraction of our solar system's 4.6 billion years. Still hot from their violent formation, HR 8799 planets emit large amounts of infrared light that give scientists valuable data on how their ...