Hundreds of people who love the little planet that was dissed, gather every year in the Arizona town where Pluto was ...

Scientists studying the interstellar object ‘Oumuamua have proposed that it may be a fragment from a Pluto-like planet beyond our solar system. Researchers from Arizona State University's School of ...

Pluto has not completed a single orbit since its 1930 discovery. With a 248-year journey around the Sun, the dwarf planet ...

Flagstaff, Arizona (CNN) — For no explainable practical reason, humans are enamored with – and even empathetic toward – specific inanimate objects. Our first car. A choice coffee mug. And for a ...

In our solar system, Jupiter is the undisputed king. If you added more mass to Jupiter, it wouldn’t actually get much bigger ...

What is a planetary retrograde? And what connection does it have to astrology? We explain how planets move across the sky.

The year 2006 was full of cultural shock waves: Twitter was loosed upon the internet, Pluto was declared a dwarf planet, and ...

Sky This Week is brought to you in part by Celestron. Friday, March 13Look north this evening a couple hours after sunset and ...