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The following article was published in our article directory on January 16, 2013.
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Carbon Planets Turn Earth's Chemistry on Its Head

Article Category: Education

Author Name: Justin Harris

The study of exoplanets-- globes orbiting remote stars-- is still in its early days. Yet already researchers have found hundreds of worlds with no nearby analog: giants that could steamroll Jupiter; small pebbles broiling under stellar furnaces; billowy oddballs with the density of peat moss. Still other exoplanets may look familiar in broad-brush, just to disclose a topsy-turvy realm where uncommon substances are normal, and vice versa.

Take carbon, for example: the vital constituent of natural matter accounts for a few of humankind's most precious products, from diamonds to oil. Regardless of its outsize importance, carbon is unusual-- it comprises less than 0.1 percent of Earth's mass.

On other globes, though, carbon might be as typical as dirt. Carbon and dirt might be one and the exact same. An exoplanet 40 light-years away was recently identified as a promising candidate for just such a place-- where carbon dominates and where the stress in the planet's interior crushes substantial quantities of the element into diamond.

The planet, called 55 Cancri e, might have a crust of graphite several hundred kilometers thick. "As you go underneath that, you see a thick layer of diamond," states astrophysicist Nikku Madhusudhan, a postdoctoral fellow at Yale University. The crystalline diamond can account for a 3rd of the planet's thickness.

If the composition of the sun is any indication, the cloud of dust and gas that coalesced into the planets of our solar system ought to have actually included about twice as much oxygen as carbon. Astronomers have actually figured out that 55 Cancri e's host star, nonetheless, includes a little more carbon than oxygen, which might mirror a very different planet-forming environment. And Madhusudhan and his colleagues calculated that the planet's bulk properties-- denser than a water globe however less dense than a globe made of Earth-like minerals-- match those anticipated for a carbon planet.

Life-forms on a carbon planet-- if they exist-- would little resemble the oxygen-dependent organisms of Earth. Priceless oxygen would show important as a fuel in much the same method that humans yearn for hydrocarbon fuels on Earth, states Marc Kuchner of the NASA Goddard Space Flight. Even courtship customs would be globes apart from ours. "You would not be impressed if somebody offered you a diamond ring," Kuchner muses. "If your date appeared with a glass of water, that would be truly stimulating.".

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