Dr. Elisa Quintana<\/a> of the SETI Institute and NASA’s Ames Research Center in Mountain View, California. “This is sort of a first step.”<\/p>\nWe know the size of the new planet, but not its mass and composition. Scientists are fairly sure it is rocky, not a gas giant. Because Kepler-186f is beyond telescope range, we cannot measure its atmosphere and greenhouse effect, and without that knowledge, we can’t call it “an Earth twin,” only “an Earth cousin” thus far.<\/p>\n
Nonetheless, in a comment accompanying the breakthrough study, Yudhijit Bhattacharjee of Science<\/em> states that “the finding could open a wide new hunting ground for extraterrestrial life” orbiting other red dwarf stars, which make up three-quarters of the Milky Way.<\/p>\nCanadian coauthor Jason Rowe has added:<\/p>\n
“If Earth-like planets are common around stars like that, we have potentially habitable zone planets in our own backyard—planets that already might be receiving the first radio broadcasts that came from the Earth.”<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"Artist’s conception of Kepler-186f in its solar system (NASA Ames\/SETI Institute\/JPL-Caltech) It’s a bit less possible now that we’re alone in the universe. The $600-million Kepler Space Telescope, launched five years ago to identify planets, has spotted more than 3,800 and confirmed 966 of them. 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