The "new stars" are best seen from the Southern Hemisphere, but people have spotted them from the United States by looking ...

With a width of about 2,377 kilometers, Pluto, the biggest dwarf planet, is significantly larger in comparison. This means 2017 OF201 is quite big but still much smaller than Earth.

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Scientists have discovered a giant planet called TOI-6894b, orbiting a star that should be far too small to have formed it.