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 ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

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 ...

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, ...

This once-in-a-generation shift is a pivotal power play in a saga that will unfold in the years and decades to come.

University of Arizona researchers have unveiled evidence of romance at the farthest reaches of the solar system: a cosmic ...