On February 18, 1930, amateur astronomer Clyde Tombaugh discovered "Planet X" using an astrograph, which is essentially a space camera. Planet X was soon named Pluto, and the rest is a nerd battle of ...

When the late American astronomer Clyde W. Tombaugh discovered planet Pluto 76 years ago this month, he opened the gateway to an unknown region of ancient, icy objects unlike any worlds in our solar ...

What was discovered in Flagstaff, Arizona, and killed off in Prague? If you answered "Pluto's planethood," your grasp of the astronomical is excellent. Feb. 18 marks the 95th anniversary of the ...

Add Yahoo as a preferred source to see more of our stories on Google. Image of Pluto interlaid with portrait of Clyde Tombaugh with his homemade telescope Clyde Tombaugh's passion for astronomy began ...

Add Yahoo as a preferred source to see more of our stories on Google. On February 18, 1930, the American astronomer Clyde Tombaugh discovered Pluto!Before he discovered Pluto, another astronomer named ...

An image of Pluto taken by NASA's New Horizons spacecraft on July 13, 2015. The planet was first discovered by Clyde Tombaugh, who graduated from high school in rural Kansas and went on to earn his ...

On Aug. 24, 2006, the International Astronomical Union declared that Pluto was no longer a full-fledged planet, demoting it to the status of a "dwarf planet." And people the world over who probably ...

Friends and colleagues of the late Clyde Tombaugh, discoverer of Pluto, had this to say Friday about the International Astronomical Union’s decision to reclassify Pluto as a “dwarf planet”: Don’t ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Scientists claim to have solved the mystery behind the heart shape on ...

Twenty years after Pluto became a dwarf planet, people are still fighting over its status. Experts explain why the debate feels so personal.

For decades, scientists and the general public have argued over the astronomical status of beloved dwarf planet Pluto. In the latest salvo, NASA Administrator Jared Isaacman said that he was “very ...