Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...
Pluto is a tiny icy world way out at the edge of our solar system. In 1930, an American astronomer named Clyde Tombaugh discovered it, and for a long time, everyone called it the ninth planet. Then, ...
On Tuesday, responding to a question during a testimony to a US Senate committee, NASA administrator Jared Isaacman said he ...
Pluto was downgraded from a planet to a dwarf planet in 2006 by the International Astronomical Union. The main reason for Pluto's demotion is that it's not able to "clear its orbit of debris." Other ...
Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...
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