WOW: HUBBLE DETECTS ORGANIC MOLECULES ON PLUTO

Hubble observations revealed that some substances on Pluto's surface are absorbing more ultraviolet light than expected. The compounds in question may well be organics, possibly complex hydrocarbons or nitrogen-containing molecules, researchers said. 

The dwarf planet Pluto is known to harbor ices of methane, carbon monoxide and nitrogen on its surface. The ultraviolet-absorbing chemical species may have been produced when sunlight or super-speedy subatomic particles known as cosmic rays interacted with these ices, researchers said.

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