facebook
twitter
rss
account
search
search
 

Milky Way may have 100 billion planets

Jan. 3, 2013 at 5:10 PM   |   Comments

PASADENA, Calif., Jan. 3 (UPI) -- U.S. astronomers say a study suggests planets are in fact the cosmic norm and estimate the Milky Way galaxy contains at least 100 billion planets.

A team of astronomers at the California Institute of Technology made the estimate while analyzing planets orbiting a star called Kepler-32, worlds they say are representative of the vast majority in the galaxy and are a perfect case study for understanding how most planets form.

Kepler-32's planets were detected by the Kepler space telescope, and the researchers have analyzed the five-planet system and compared it to other systems found by the Kepler mission, a Caltech release reported Thursday.

Kepler-32 is an M dwarf, a type that accounts for about 75 percent of all stars in the Milky Way, and its planets are typical of the class of worlds the telescope has discovered orbiting other such stars.

It's a system astronomers say will help in understanding planet formation in general.

"I usually try not to call things 'Rosetta stones,' but this is as close to a Rosetta stone as anything I've seen," planetary astronomy Professor John Johnson said. "It's like unlocking a language that we're trying to understand -- the language of planet formation."

Based on their study of Kepler-32, the astronomers have calculated that there is, on average, one planet for every one of the approximately 100 billion stars in the Milky Way.

"There's at least 100 billion planets in the galaxy -- just our galaxy," Johnson said. "That's mind-boggling."

Topics: John Johnson
© 2013 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Most Popular
1
6,000-year-old temple discovered in prehistoric Ukraine settlement 6,000-year-old temple discovered in prehistoric Ukraine settlement
2
NASA orbiter beams back images of Siding Spring comet NASA orbiter beams back images of Siding Spring comet
3
An ancient tsunami wrecked Hawaii; it could happen again An ancient tsunami wrecked Hawaii; it could happen again
4
DC drone hobbyists in limbo over flying locations DC drone hobbyists in limbo over flying locations
5
Protestors object plans to build telescope on land sacred to native Hawaiians Protestors object plans to build telescope on land sacred to native Hawaiians
Trending News
Around the Web
x
Feedback