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måndag, juni 19, 2017

Is Earth All by Its Lonesome? Kepler Finds 4,034 Possible Companions









Researchers have discovered a gap in the distribution of planet sizes, indicating that most planets discovered by Kepler so far fall into two distinct size classes: the rocky Earths and super-Earths (similar to Kepler-452b), and the mini-Neptunes (similar to Kepler-22b).CreditNASA/Ames, via Caltech, via University of Hawaii (B. J. Fulton

MOUNTAIN VIEW, Calif. — Are we still alone?
Setting the stage for the next chapter in the quest to end cosmic loneliness, astronomers released a list on Monday of 4,034 objects they are 90 percent sure are planets orbiting other stars.
The new list is the final and most reliable result of a four-year cosmic census of a tiny region of the Milky Way by NASA’s Kepler spacecraft.
“The search for planets is the search for life,” said Natalie Batalha, a Kepler mission scientist from NASA’s Ames Research Center. “These results will form the basis for future searches for life.”
Extrapolated from one small patch to the entire sky, the data will help NASA design a space telescope for the 2030s or thereabouts, big and powerful enough to discern the images of planets around other stars.

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