Earlier this week, Saturn gained a whopping 128 new official moons, as the International Astronomical Union recognised ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

Saturn surpasses Jupiter with 128 newly discovered moons, becoming the planet with the most moons in our solar system.

Names of astronomical objects are governed by the International Astronomical Union (IAU). Originally, all moons in the Solar ... such as "S/2020 S 27". Without a solid definition of what a moon is, it ...

EXCLUSIVE: Democratic lawmakers would not provide a definition of a woman when pressed on Capitol Hill, as President Donald Trump prioritizes making clear distinctions between biological sexes ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

Pluto was reclassified from a planet to a dwarf planet by the International Astronomical Union because it did not meet all three criteria of their updated definition ... to the IAU, a planet ...