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View Full Version : 25% of Sun-Like Stars Could Host Earth-Sized Worlds



Fraser
2010-Oct-28, 06:10 PM
A five-year survey of nearby solar-mass stars has provided astronomers with an estimate of how many stars of this type could have Earth-size planets. Andrew Howard and Geoffrey Marcy from the University of California Berkeley studied 166 G and K stars within 80 light years of Earth, determining the number, mass and orbital distance of [...]

More... (http://www.universetoday.com/76870/25-of-sun-like-stars-could-host-earth-sized-worlds/)

George
2010-Oct-28, 06:32 PM
Well, that could be a fair guess, I suppose:


“Of about 100 typical sun-like stars, one or two have planets the size of Jupiter, roughly six have a planet the size of Neptune, and about 12 have super-Earths between three and 10 Earth masses,” said Howard. “If we extrapolate down to Earth-size planets – between one-half and two times the mass of Earth – we predict that you’d find about 23 for every 100 stars.”