Filmmaker Adam Nemoy helps celebrate the 90th anniversary of Pluto's discovery this month at the 6th annual 'I Heart Pluto' ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Scientists using data from the European Space Agency’s Gaia mission have made a groundbreaking discovery: a massive exoplanet ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...

With an assist from the NEID spectrograph, a team of astronomers have confirmed the existence of exoplanet Gaia-4b—one of the ...

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

Charon is the largest moon of the dwarf planet Pluto ... Whereas a moon usually orbits a planet, both Pluto and Charon orbit a point in space between them — their common center of mass.

For Neptune, in its wide and distant orbit at about 30 AU, the difference between the perihelion and aphelion is 0.5 AU, according to the Royal Greenwich Observatory. Dwarf planet Pluto ...

Scientists studying samples that NASA collected from the asteroid Bennu found a wide assortment of organic molecules that ...