Twenty years ago, Pluto lost its planet status, a decision that still sparks debate. Today, NASA's new chief, Jared Isaacman, wants to restore its former glory. During a hearing before the ...

Scientists have recently unveiled a remarkable discovery in the outer reaches of our solar system: a space fossil located 4 billion miles past Pluto, covered in unidentified organic molecules. This ...

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

Add Yahoo as a preferred source to see more of our stories on Google. Guests visting the Lowell Observatory in Flagstaff, Arizona during the I Heart Pluto Festival gaze at celestial objects from the ...

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 ...

A new tiny ice world has been discovered beyond Pluto surrounded by a thin atmosphere, scientists revealed. The "mini-pluto" is thought to be the solar system's smallest object, but still has a ...

For no explainable practical reason, humans are enamored with – and even empathetic toward – specific inanimate objects. Our first car. A choice coffee mug. And for a particular subset of the ...