Our solar system hosts almost 900 known moons; more than 400 orbit the eight planets while the remaining orbit dwarf planets, ...

A rare planetary parade of six planets will light up the night sky at the end of February, with four visible to the naked eye ...

On Saturday, go outside about an hour after sunset, look to the western sky and spot Mercury, Venus and Saturn close to the horizon.

Far beyond Neptune, in the frozen depths of the Kuiper Belt, many ancient objects oddly resemble giant snowmen made of ice ...

Computer simulations suggest NASA’s Habitable Worlds Observatory could detect Earth-like exomoons around gas giant exoplanets through reflected starlight and lunar eclipses.

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how ...

The curious minds at What If explore what would happen if Kepler 22-b suddenly appeared in our solar system, revealing the gravitational, orbital, and planetary chaos that would follow.

Our solar system may be the odd one out. Across the Milky Way, astronomers keep finding super-Earths, planets larger than our ...

Scientists say aliens are not hiding in Area 51. Experts believe life may exist on distant planets with water and the right ...

With Area 51 ruled out by President Obama, where might aliens really be hiding? Scientists have now revealed the best candidates.

For 15 years, one nearby exoplanet refused to reveal its secrets, its spectrum stubbornly flat, its atmosphere unreadable.