The "Star Trek" legend's only son will discuss his memoir at the annual space-themed event.

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

In August 2006, the International Astronomical Union made the controversial, but correct, decision to demote Pluto from its ...

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

If planets had social media accounts, the solar system would showcase a frenzy of unique personalities. Mercury tweets at ...

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

A four-year-old boy's curiosity about planets has inspired him to write his first children's book. Viaan Mundeja-Gupta, who is fascinated by the cosmos, came up with an imaginative story about making ...

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

Executive order mandates changes on US maps. But will other countries follow suit? Learn more about this renaming.

Beautiful photos of the six planets aligned in the night sky have emerged online. Mars, Jupiter, Uranus, Neptune, Venus and Saturn are all currently lined up in a row and will be visible in the night ...