Smithsonian Magazine on MSN
Could Pluto once again be considered a planet? New remarks from NASA's administrator highlight an enduring debate among scientists
For decades, scientists and the general public have argued over the astronomical status of beloved dwarf planet Pluto. In the ...
It's been 20 years since Pluto was declassified as the ninth planet in our solar system, and many people wish it had never lost its status. A recent comment from NASA Administrator Jared Isaacman ...
In 2006, updated research led to Pluto being controversially demoted to dwarf planet status by the International Astronomical Union. The reasoning was that Pluto's location in the far-flung ...
If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.
The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...
On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...
In the far reaches of our solar system — beyond the outermost planet Neptune — resides a host of icy and desolate celestial ...
On July 14, 2015, NASA's New Horizons spacecraft arrived at Pluto for the first time. The craft flew within 7,700 miles of the planet and is sending back reams of data and the highest resolution ...
A gradual dimming and brightening when a star passed behind it suggested the mini-Pluto was wrapped in a thin layer of air.
A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results