Search For Earth's Twin Narrows Down To M-Dwarfs

The most common stars in our galaxy were too small to be seen until recently. A new study suggests that there's a good chance that they support Earth-like planets.

What's the Latest Development?

A study done by astronomers at Harvard University suggests that greater attention should be paid to a class of stars called M-dwarfs, since it seems that almost all of the more than 300 Earth-sized exoplanets currently discovered by NASA's Kepler telescope orbit around one of them. According to astronomer David Charbonneau, “If the Sun is a hundred-watt bulb, M-dwarfs are Christmas-tree lights.” They constitute only a small portion of the total number of stars in Kepler's vision, but they make up a large portion of the stars in the Milky Way. 

What's the Big Idea?

M-dwarfs tend to be more active than our Sun, but the period of activity lasts much longer, which means that any Earth-sized planet that exists in an M-dwarf's habitable zone may have been supporting life for as many as 10 billion years -- more than twice as long as Earth. Thanks in part to Kepler, scientists know that at least 248 M-dwarfs are in our immediate area. If it turns out that these stars are most likely to have Earth-like planets around them, the nearest one could be as little as 13 light-years away -- a distance that the study's lead author Courtney Dressing says "is like a stroll across the park" in astronomical terms.

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