科學(xué)60秒:尋找“地球號(hào)”

If there's a line in Vegas on the odds of life on another planet, now might be a good time to -1-. A study in the journal Science examined 166 sun-sized stars and found nearly one in four had rocky, earth-sized planets in close,-2-. The finding might chart a new course for extrasolar planet research. Most planet-formation models predict a “planet desert” within one -3- (or the average distance from the Earth to the sun) of a host star. Gaseous planets like Jupiter or Saturn, which form much farther away, on the cold side of what’s called the “ice line,” are thought to be more common. But a team of researchers at Hawaii's Keck observatory -4- on stars similar to our sun. Twenty-three percent ......The researchers say their discovery calls for substantial revisions to current astronomical models.It also makes the possibility of life on some similar planet spinning a similar, habitable distance from its sun seem like -5-.
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