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Smallest planet yet found outside solar system
LOS ANGELES (AP) - Astronomers searching for planets outside our solar system have discovered the tiniest one yet _ one that’s about the size of our moon.
But hunters for life in the universe will need to poke elsewhere. The new world orbits too close to its sun-like star and is too sizzling to support life. Its surface temperature is an estimated 700 degrees Fahrenheit. It also lacks an atmosphere and water on its rocky surface.
“This new discovery raises the specter that the universe is jampacked, like jelly beans in a jar, with planets even smaller than Earth,” said Marcy, who had no role in the new research.
It’s been nearly two decades since the first planet was found outside our solar system. Since then, there’s been an explosion of discoveries, accelerated by NASA’s Kepler telescope launched in 2009 to search for a twin Earth. So far, 861 planets have been spotted and only recently have scientists been able to detect planets that are similar in size to Earth or smaller.
While scientists have theorized the existence of a celestial body that’s smaller than Mercury _ the baby of the solar system since Pluto’s downgrade _ they have not spotted one until now. Nearest to the sun, Mercury is about two-fifths the Earth’s diameter; the newly discovered planet and our moon are about a third the size of Earth.
The teeny planet was detected by Kepler, which simultaneously tracks more than 150,000 stars for slight dips in brightness _ a sign of a planet passing in front of the star. The planet _ known as Kepler-37b _ orbits a star 210 light years away in the constellation Lyra. It’s one of three known planets in that solar system.
Discoverer Thomas Barclay of the NASA Ames Research Center in Northern California was so excited when he spied the moon-sized planet that for days, he said he recited the “Star Wars” movie line: “That’s no moon.” It took more than a year and an international team to confirm that it was a bona fide planet.
The discovery is detailed in Thursday’s issue of the journal Nature.
Scientists are looking for an Earth-size planet that’s in the so-called Goldilocks zone _ that sweet spot that’s not too hot and not too cold where water, which is essential for life, could exist on the surface.
While the newly discovered planet isn’t it, “that does not detract from the fact that this is yet another mile marker along the way to habitable Earth-like planets,” said Alan Boss of the Carnegie Institution for Science in Washington, who was not part of the discovery team.
By Brahma Chellaney
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