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evaporating planet

01.09.2003

French and Swiss astronomers have discovered in the constellation Pegasus, 137 light years from Earth, a planet that is evaporating before our eyes.

The planet, which first received the index HD209458b and then the name Osiris in honor of the ancient Egyptian deity, is located very close to the central star of its system, only seven million kilometers from it. For comparison: the Earth is 150 million kilometers from the Sun, and Mercury, our hottest planet, is 58 million.

The atmosphere of Osiris consists mainly of hydrogen, it is heated by the star to about 1900 degrees Celsius, and hydrogen evaporates at a rate of at least 10 thousand tons per second. But, since the planet is very large, slightly smaller than Jupiter, by the end of the existence of the star evaporating it, it will lose only 0,1 percent of its mass.

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