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NASA: Pluto Has Blue Sky

Pluto’s haze layer shows its blue color in this picture taken by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC). The high-altitude haze is thought to be similar in nature to that seen at Saturn’s moon Titan. The source of both hazes l

Pluto has blue skies and water in ice form, according to the first color photos recently taken by NASA’s New Horizons spacecraft.

“Who would have expected a blue sky in the Kuiper Belt? It’s gorgeous,” said Alan Stern, New Horizons principal investigator from Southwest Research Institute (SwRI), Boulder, Colorado in a statement.

NASA said the particles that cause the blue haze are likely gray or red, but that they scatter blue light in the same way tiny nitrogen particles cause the Earth’s skies to appear blue.

On Pluto, the scientists said the particles called tholins are likely larger and “soot-like.”

The photos also revealed the presence of “numerous small, exposed regions of water ice” on the dwarf planet.

“Large expanses of Pluto don’t show exposed water ice,” said science team member Jason Cook, of SwRI, “because it’s apparently masked by other, more volatile ices across most of the planet. Understanding why water appears exactly where it does, and not in other places, is a challenge that we are digging into.”

Pluto’s ice, scientists say, is red colored.

“We don’t yet understand the relationship between water ice and the reddish tholin colorants on Pluto's surface, said Silvia Protopapa, a science team member from the University of Maryland, College Park.

NASA said the New Horizons spacecraft is now approximately 5 billion kilometers from Earth.