Life on Billions of Planets? Could Be

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Zap!
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Life on Billions of Planets? Could Be

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"The Creator must have an inordinate fondness for beetles," the early 20th-century biologist J.B.S. Haldane once said. "He made so many of them." If Haldane had been an astronomer, he might have said the same about the nondescript red stars known as M-dwarfs. As the name implies, they're small, no more than half the size of our Sun at most. They're so dim that not a single one, not even the closest, is visible to the naked eye. And they vastly outnumber any other type of star in the Milky Way: our galaxy has maybe ten or 20 billion Sun-like G stars, but is home to 150 billion M-dwarfs, and maybe more, adding up to some 80% of the galaxy's stellar population.
That's what makes a new report by a group of European astronomers so exciting. Working at the European Southern Observatory in Chile, the scientists have completed a survey of 102 M-dwarf stars and identified a total of nine "super-Earths" — planets up to 10 times larger than Earth — circling them. Two of the nine lie in their stars' habitable zones, the Goldilocks region where temperatures are not too hot, not too cold, but just right for liquid water and thus, conceivably, for the existence of life. In the case of an M-dwarf, the star's cooler, dimmer fires mean that the Goldilocks zone is closer than it is around our hotter, brighter sun, but the water principle remains the same. And if you do the math for the entire galaxy, the recent survey means that tens of billions of Goldilocks planets are peppered throughout the Milky Way, with a hundred or so just in our solar system's immediate neighborhood.

For planet-hunters, that's an especially tantalizing prospect. Ground- and space-based telescopes have discovered many hundreds of worlds orbiting stars other than the Sun — several thousand if you include likely but unconfirmed planets found by the orbiting Kepler probe. But most of them are so far away that the prospects of actually being able to determine whether they have life are exceedingly dim, even with a new generation of giant telescopes, because the planets themselves are so dim. With so many M-dwarfs right around the cosmic corner, however, and with so many relatively small planets orbiting in their habitable zones, the job will be orders of magnitude easier.


Read more: http://www.time.com/time/health/article ... z1qcfjBo9o
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