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.

Summer 2015 was marked by a unique astronomical event, which occurs approximately once in ... the history of astronomy. The ...

Our white dwarf Sun will cool for billions upon billions of years, slowly fading away as a dark, solid carbon-oxygen ball.

If it’s real, some may question whether something with a mass about three times Pluto’s counts as a planet at all.

Lowell Observatory will be hosting the 2025 I Heart Pluto Festival from Feb. 13 to 17, celebrating the planet and its ...

Scientists have discovered a new type of planetary collision called “kiss-and-capture,” where Pluto and proto-Charon briefly ...

While Charon is currently listed as a satellite or moon by the International Astronomical Union (IAU), consideration is being given to it perhaps being classified as a dwarf planet in its own right, ...

Pluto seemed hopelessly cold and distant until 2015, when NASA’s New Horizons space probe beamed back images of the giant heart-shaped mark that dominates the dwarf planet’s surface.