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Pluto fit that ancient description perfectly: it does not twinkle and appears to wander about the night sky, very unlike a star. But the definition of planet has changed many times over the ...

The search for Planet X The search for Pluto did not begin with Clyde Tombaugh, to be fair. That distinction belongs to the visionary astronomer Percival Lowell.

Pluto was demoted from a planet to a dwarf planet in 2006. So why is its status still so controversial today? When you purchase through links on our site, we may earn an affiliate commission.

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Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...

Pluto, officially a dwarf planet, has surprising complexity on its surface. While certainly a world, not everyone agrees it is a planet.