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Friday, March 19, 2010

Rock Snow May Fall From Exoplanet Skies

Rock Snow May Fall From Exoplanet Skies
Eight existence ago, astronomers announced the discovery of 51 Pegasi b (51 Peg b), the first planet found turning a sun-like star beyond our solar system. The planet is about the measure of Jupiter, but it orbits far sooner to its parent star than Mercury orbits the sun. A time on 51 Peg b lastsjust four Land-living days. That got Brian Jackson, a university at the Carnegie Institution for Science in Washington DC, and age group odd if organize were planets located dull sooner to their countless stars. So they began sifting through close to three existence of data levelheaded by NASA's Kepler space lessen.

The observatory, now sidelined by a positioning system unproductiveness, looked for understated dips in the use of light outlook from resolve stars, augur forceful secret code of planets tiny by, or transiting, background to the telescope's line of sight.

Kepler was believed to expedition out Earth-like worlds by accident located from their parent stars for sticky bank water, the assumed "Goldlilocks" zone rumored to be positive for life.

But staring at 150,000 stars for four existence turned up thousands of other augur planets, by four aspirant planets together with orbits 20 grow old sooner than Mercury circles the sun.

Superficial temperatures on these planets would dash further than 3,000 degrees Fahrenheit -- hot amply to ardent rock.

One suspected planet, referred to as KOI-1843, circles its countless star in 4.2 hours -- an surround that brings it 40 grow old sooner to its star than Mercury orbits the sun -- together with a bank temperatures of about 4,200 degrees Fahrenheit.

Conditions on these planets would be impressive. Surfaces on their day-sides are untreated molten rock, group up the odd prospect of wrinkled mist atmospheres that frame concerning "rock flurry" sinking on their sooner cooler night-sides.

"That might be very remarkable," Jackson told journalists into a webcast press conference at the American In height Discernment converse in Denver this week.

"These molten rock lakes might shed a wrinkled mist atmosphere that might go high-pitched gruffly to the night side of the planet and then be deposited as put together of a rock flurry as the rock mist cools," Jackson thought.

Since life on these worlds is water supply austere, discrimination extrasolar planets that rub their parent stars is allowance scientists summation out how planets form and further.

"They didn't form organize, about unequivocally," Jackson told Discovery Statistics.

For starters, temperatures in the unchanged gas disks from which the planets formed would transmit been too high at the planets' current locations for them to form, Jackson snide out.

As well, the parent stars were considerably greater than before in their inferior, putting the planets in the field of the stars, he other.

"They necessary transmit formed considerably slim out and then were brought in by particular processes or amass of processes. We don't basically realize how they got so end," Jackson thought.

The research has been submitted to the Astral Magazine and appears in the online annals arxiv.org.

Credit: discovery.com