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

A new model that incorporates data gathered by the JWST could help scientists understand the composition and mass of objects ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

The dwarf planet has a thin atmosphere composed primarily ... Charon, the largest of these moons, is nearly half the size of Pluto itself. Also read: 'Comet of the Year' Tsuchinshan-ATLAS ...

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

By measuring the size of the shadows ... A New Horizons image of Pluto and its moon Charon revealed more surprises about the dwarf planet and its orbiting moon. Click on the hand to see why ...

Gonggong is a dwarf planet and a member of the scattered disc beyond Neptune. As of 2019, its distance from the Sun is 88 AU, and it is the sixth-farthest known Solar System object.

Either both are planets, some scientists say ... is about 1,800 miles in diameter, whereas Pluto’s diameter is about 1,380 miles. Neither one is “big.” Earth’s moon is 2,160 miles in ...

Viewed in this longer context, the previously modern idea of having nine planets, which came about in the 1960s and lasted only until 2006, was a blip on the screen. And if you are still a Pluto ...

Factors that distinguish Pluto from the terrestrial and Jovian planets include its composition (ice, rock, and frozen gases), changing atmosphere, small size, comparatively large moon, and its ...