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March 24, 2005

Astronomers detect light from two planets outside our solar system


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Tuesday, Astronomers detected light from two planets circling stars outside our solar system, using a space telescope. One of the planets is 140 light years from Earth and the other one is 500 light years.

This marks the first time light from 'extra-solar' planets has been confirmed, and scientists at NASA say it means other distant planets can be directly measured and compared. "We've been hunting for this light for almost 10 years since extra-solar planets were first discovered," said David Charbonneau of the Harvard-Smithsonian Center for Astrophysics.

David Charbonneau, detected an infrared light emitted by a warm object, a planet in the constellation Lyra. Dr. Charbonneau says the planets have been difficult to see in visible light because they are outshown by their stars, which are 10,000 times brighter. He says viewing the solar systems through the red tones of the infrared spectrum reduces the glare.

"If we put on our infrared goggles with the Spitzer Space Telescope, then suddenly the planet brightens up, and the contrast ratio, the difference in light between the star and planet is much, much more favorable, and we are to isolate that light from the planet directly and study it," he said.

The other team, led by Drake Deming – of NASA's Goddard Space Flight Center – detected a light from yet another planetary system.







 

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