Like the icebergs that float in Earth's Arctic Ocean, it seems Pluto has water ice 'hills' that float atop an ocean of frozen nitrogen.
Pluto's largest moon, Charon, is cloaked in darkness, with just a tiny sliver lit up by the distant sun, in a newly released photo.
Water ice is surprisingly abundant on Pluto's surface, a new map of the dwarf planet reveals.
Pictures are still filtering back from NASA's New Horizons close-up of Pluto last year and one of the biggest surprises so far comes from the region informally known as Sputnik Planum.
The astronomer who helped kick Pluto out of the planet club believes a much larger body may be lurking in the outskirts of the solar system.
Pluto's weirdly dynamic and 'young' surface has just become even more intriguing with the release of this stunning color image of what is thought to be a huge cryovolcano, or ice volcano.
Is this a mystery for Mulder and Scully? Probably not, but it demonstrates how surprisingly dynamic Pluto's icy surface really is.
It's been a long time coming, but the US Postal Service has released its designs for its 2016 stamps and one set rightfully features the biggest space story of 2015 -- NASA's New Horizons mission to Pluto.
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