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Our Milky Way is Home to at Least 100 Billion Planets

 
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Our Milky Way is Home to at Least 100 Billion Planets
That’s the conclusion of a new study by astronomers at the California Institute of Technology (Caltech) that 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—exoplanets that are representative, they say, of the vast majority in our Galaxy and thus serve as a perfect case study for understanding how most planets form.
“There’s 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.”

“It’s a staggering number, if you think about it,” adds Jonathan Swift, a postdoc at Caltech and lead author of the paper. “Basically there’s one of these planets per star.”

The planetary system in question, which was detected by the Kepler space telescope, contains five planets. The existence of two of those planets have already been confirmed by other astronomers. The Caltech team confirmed the remaining three, then analyzed the five-planet system and compared it to other systems found by the Kepler mission.

The planets orbit a star that is an M dwarf—a type that accounts for about three-quarters of all stars in the Milky Way. The five planets, which are similar in size to Earth and orbit close to their star, are also typical of the class of planets that the telescope has discovered orbiting other M dwarfs, Swift says. Therefore, the majority of planets in the galaxy probably have characteristics comparable to those of the five planets.

While this particular system may not be unique, what does set it apart is its coincidental orientation: the orbits of the planets lie in a plane that’s positioned such that Kepler views the system edge-on. Due to this rare orientation, each planet blocks Kepler -32&#8242;s starlight as it passes between the star and the Kepler telescope.

LINK: [link to annesastronomynews.com]
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Re: Our Milky Way is Home to at Least 100 Billion Planets
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