Hubble’s view of tiny, distant Pluto is reminiscent of looking at Mars through a small telescope,” said Dr. Alan Stern of Southwest Research Institute’s Boulder, Colorado research office ...

That, plus Pluto’s small size—smaller than our moon—suggested that the world did not accrete in its current orbit from the ...

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

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

"But forget it. It's too small an object that's too far away." The first images of Pluto might start coming in tonight, but not until NASA first receives a signal confirming the flyby was a success.

An curved arrow pointing right. NASA's New Horizons spacecraft took us to Pluto for the first time in July 2015. Scientists are astonished by the incredible features they've observed on the dwarf ...

Speakers Diane Phelps Budden and Kevin Schindler will present “Tiny Pluto Has a Big Heart” at the Sedona Heritage Museum on ...

Pluto is too far away from Earth to be seen with the naked eye. If you stood on Pluto's surface, the Sun would merely appear to be a very bright star. Although previous images showed that ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...