The researchers say they found hints of frozen chemicals hidden beneath Pluto's crust in data obtained by the James Clerk Maxwell Telescope (JCMT) on Hawaii in the late 1990s.
"This was a bit like using a telescope as a digger to mine into Pluto, but with less effort!" astrophysics researcher Jane Greaves of the University of St Andrews in Scotland said in a statement.
Pluto, which was only discovered in 1930, orbits between 2.7 billion and 4.5 billion miles (4.4 billion and 7.3 billion kilometers) from the sun. For comparison, Earth orbits 93 million, or 150 km, from our star. Powerful observatories, such as the Hubble Space Telescope, have taken detailed images and maps of Pluto in recent years, even discovering new moons around the dwarf planet. Nonetheless, Pluto has remained quite mysterious because it is so far away.
Earthlings will finally get a detailed look at part of the frigid body next year when NASA's New Horizons spacecraft flies by Pluto. The probe left Earth in 2006, the same year Pluto was dethroned from its position as our solar system's ninth planet. New Horizons will be just the fifth spacecraft to travel so far away from home, behind Pioneer 10, Pioneer 11, Voyager 1 and Voyager 2.
In anticipation of this historic mission, Greaves and her undergraduate student Ailsa Whitelaw said they looked at old data from JCMT's SCUBA (Submillimeter Common-User Bolometer Array), two instruments which scanned the cosmos in the submillimeter range of the electromagnetic spectrum — wavelengths between far-infrared and microwave.
The researchers found evidence of invisible 0.85 mm waves emitted from beneath the surface of Pluto, which they believe could be linked to a possible dry layer of frozen nitrogen and methane hidden under a dark surface patch of water ice and frozen polymers.
Read more at Discovery News
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