New evidence for complex molecules on Pluto's surface

Dec 20, 2011
The Cosmic Origins Spectrograph aboard NASA's Hubble Space Telescope recently discovered a strong ultraviolet-wavelength absorber on Pluto's surface. Image courtesy NASA/STScI

(PhysOrg.com) -- The new and highly sensitive Cosmic Origins Spectrograph aboard the Hubble Space Telescope has discovered a strong ultraviolet-wavelength absorber on Pluto's surface, providing new evidence that points to the possibility of complex hydrocarbon and/or nitrile molecules lying on the surface, according to a paper recently published in the Astronomical Journal by researchers from Southwest Research Institute and Nebraska Wesleyan University.

Such chemical species can be produced by the interaction of sunlight or cosmic rays with Pluto's known surface ices, including methane, carbon monoxide and nitrogen.

The project, led by SwRI's Dr. Alan Stern, also included SwRI researchers Dr. John Spencer and Adam Shinn, and Nebraska Wesleyan University researchers Dr. Nathaniel Cunningham and student Mitch Hain.

"This is an exciting finding because complex Plutonian hydrocarbons and other molecules that could be responsible for the ultraviolet spectral features we found with Hubble may, among other things, be responsible for giving Pluto its ruddy color," said Stern.

The team also discovered evidence of changes in Pluto's compared to Hubble measurements from the 1990s. The changes may be related to differing terrains seen now versus in the 1990s, or to other effects, such as changes in the surface related to a steep increase in the pressure of Pluto's atmosphere during that same time span.

"The discovery we made with Hubble reminds us that even more exciting discoveries about Pluto's composition and surface evolution are likely to be in store when NASA's arrives at Pluto in 2015," Stern added.

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User comments : 2

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Isaacsname
5 / 5 (1) Dec 20, 2011
Nitrile on Pluto ?

I wonder if that could implicated in the development of life in our solar system ?
omatumr
1 / 5 (3) Dec 20, 2011
complex hydrocarbon and/or nitrile molecules, . . .


. . . are not unexpected on Pluto, because

a.) The most abundant elements beyond the asteroid belt are H, He, C, and N.

b.) The most abundant elements in the Sun, the inner planets, and ordinary meteorites are Fe, O, Ni, Si, S, Mg and Ca [1].

1. "Solar abundance of elements from neutron-capture cross sections"
36th Lunar & Planetary Science Conference, 1033 (2005)

www.lpi.usra.edu/...1033.pdf

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