Before 1930, Pluto was a mathematical prediction. Astronomers had spent 149 years watching Uranus's wonky orbit and estimating what must be out there in the far reaches of our solar system, majestically mucking things up. Neptune was identified as a planet in 1846, but even the presence of another gas giant didn't entirely explain what was going on with Uranus. The search was on for “Planet X.” … [Read more...] about Our Closest Look Ever at Pluto’s Weird, Beautiful Surface
