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Jinle Z

At Least 17 Billion Earth-Size Alien Planets Inhabit Milky Way | LiveScience - 0 views

www.livescience.com/size-alien-planets-aas221.html

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shared by Jinle Z on 08 Jan 13 - No Cached
  • The Milky Way
  • (Jan. 7
  • 17 percent of stars have a planet 0.8 to 1.25 times the size of Earth in tight orbits
  • ...8 more annotations...
  • 25 percent of stars have a so-called "super-Earth" (worlds 1.25 to 2 times as big as our own)
  • Only 5 percent of stars harbor a gas giant with an orbital period of 400 days or less, researchers said.
  • Kepler detects alien worlds by noting the telltale dips in brightness caused when planets cross the face of — or transit — their parent stars from the instrument's perspective.
  • minimum of 17 billion small, rocky alien worlds, or an Earth-size planet around one of every six stars.
  • Kepler
  • Planets
  • Harvard-Smithsonian Center for Astrophysics (CfA
  • The Astrophysical Journal.
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