Is Pluto even a planet? According to a recent YouGov poll ... No matter what we call Pluto, it'll still be out there, doing its Pluto thing. "Textbook authors seem to always seek authority.

but it still needs help." After all, what does it mean for a planet to "clear its orbit of other debris," which is the single criterion that Pluto fails? Do Jupiter's Trojan asteroids qualify as ...

As a result, Pluto was reclassified as a “dwarf planet,” sparking debates among stargazers still hoping for its comeback. Here is everything to know about the history of Pluto being discovered ...

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

For that's the day my father, Clyde Tombaugh, a farmboy-turned-astronomer, discovered Pluto, becoming the first American to find a planet ... Later still, university astronomers used the telescope ...

For one reason or another, some people are still upset about Pluto's demotion from planet to dwarf planet. This demotion, by the way, occurred all the way back in 2006. So, what does famed ...

New Horizons' biggest surprise was that Pluto shows signs of still being geologically active. Some unseen process or processes are renewing the surface of the dwarf planet. This has been likened ...

New Horizons image showing Pluto's smooth surface and mountains. Courtesy NASA A young surface suggests that the planet may still be geologically active, but scientists are uncertain about what form ...

A stronomer Percival Lowell founded his Arizona stargazing lab in 1894 to aid in his search for life on Mars. While that quest is still ongoing, the observatory made history as the place where ...