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Apparently the Earth has billions of cosmic neighbors ...
Maybe Trillions ?
Billions and Billions of Planets
Artist's concept shows the Kepler spacecraft. Image credit: NASA/Ames/JPL-Caltech
Look up at the night sky and you'll see stars, sure. But the sky is also filled with planets -- billions and billions of them at least.
That's the conclusion of a new study by astronomers at the California Institute of Technology in Pasadena, which provides yet more evidence that planetary systems are the cosmic norm. The team made their estimate while analyzing planets orbiting a star called Kepler-32 -- planets that are representative, they say, of the vast majority of planets in our galaxy and thus serve as a perfect case study for understanding how most of these worlds form.
"There are at least 100 billion planets in the galaxy, just our galaxy," says John Johnson, assistant professor of planetary astronomy at Caltech and coauthor of the study, which was recently accepted for publication in the Astrophysical Journal. "That's mind-boggling."
Link - http://www.nasa.gov/mission_pages/kepler/news/kepler20130103.html
Link - http://www.jpl.nasa.gov/news/news.php?release=2013-002
Link - http://www.caltech.edu/content/planets-abound
Maybe Trillions ?
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