A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

FLAGSTAFF – Clyde Tombaugh sat in the Orpheum Theater that fateful night in February 1930, waiting for clouds to pass before the 24-year-old astronomer could return to Lowell Observatory to ...

The observatory is known for its historical significance, including the discovery of Pluto in 1930 by researcher Clyde Tombaugh. TIME highlighted Lowell's new Marley Foundation Astronomy Discovery ...

An ounce of Clyde Tombaugh’s cremated remains are aboard NASA’s New Horizons spacecraft, now on the final leg of its 10-year, 3-billion-mile space odyssey to Pluto. By late June, we’ll be ...

What was discovered in Flagstaff, Arizona, and killed off in Prague? If you answered "Pluto's planethood," your grasp of the ...

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

Pluto may not be a planet any more, but you still have a chance to see the distant dwarf planet at one of Michigan's ...

Pluto was discovered in 1930 by American astronomer, Clyde Tombaugh, the Lowell Observatory said. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer at the Lowell Observatory ...

Pluto, with its heart-shaped glacier, as captured by the New Horizons spacecraftJPL/NASA Pluto will mark a birthday of sorts on March 23, 2178. No one is likely to be there to celebrate it, of course.

Clyde Tombaugh didn't set out to discover Pluto when he sent his sketches of the night sky to Lowell Observatory in Flagstaff, Arizona in 1929. More than anything, he just wanted to get off the ...