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weird planets presented by science at

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nasa

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news flash the milky way galaxy just got

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a little weirder

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back in 2011 astronomers were amazed

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when nasa's kepler spacecraft discovered

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a planet orbiting a double star system

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such a world they realized would have

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double sunsets and sunrises just like

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the fictional planet tatooine in the

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movie star wars

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yet this planet was real

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now kepler has discovered a whole system

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of planets orbiting a double star

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the star system known as kepler-47

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is located 4 900 light years from earth

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in the constellation cygnus

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two stars orbit one another at the

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center of the system

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one is similar to the sun in size but

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only 84 percent is bright

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the second star is smaller only one

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third the size of the sun and less than

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one percent as bright

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kepler found two planets orbiting this

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mismatched pair

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the presence of a full-fledged planetary

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system orbiting kepler-47 is an amazing

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discovery says greg laughlin professor

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of astrophysics and planetary science at

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the university of california in santa

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cruz

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this is going to change the way we think

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about the formation of planets

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the inner planet kepler-47b

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closely circles the pair of stars

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completing each orbit in less than 50

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days

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astronomers think it is a sweltering

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world where the destruction of methane

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in its superheated atmosphere might lead

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to a thick global haze

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kepler-47b

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is about three times the size of earth

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the outer planet kepler-47c

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orbits every 303 days this puts it in

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the system's habitable zone a band of

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orbits that are just right for liquid

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water to exist on the surface of a

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planet

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possibly not the astronomers think it is

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a gas giant slightly larger than neptune

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the discovery of planets orbiting double

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stars means that planetary systems are

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even weirder and more abundant than

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previously thought

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many stars are part of multiple star

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systems where two or more stars orbit

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one another the question always has been

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do they have planets and planetary

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systems says william beruki

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kepler mission principal investigator at

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nasa's ames research center this kepler

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discovery proves that they do

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our own sun is a single isolated star

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with a relatively simple gravitational

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field that rules the motions of the

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planets orbiting it

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but as baruchi points out not all stars

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are single astronomers estimate that

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more than half of the stars in the

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galaxy have companions there are double

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triple and even quadruple star systems

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any planets in such systems would have

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to navigate a complex gravitational

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field tugged in multiple directions by

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multiple stars

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in fact for many years astronomers

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doubted that planets could even form in

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such an environment kepler-47 erases

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those doubts and poses a conundrum

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these planets are very difficult to form

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using the currently accepted paradigm

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says laughlin i believe that theorists

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myself included will be going back to

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the drawing board to try to improve our

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understanding of how planets are

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assembled in the dusty gaseous disks

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that surround many young stars

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the kepler spacecraft is on a mission to

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find earth-like planets that might

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support life

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says beruki in our search for habitable

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worlds we have just found more

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opportunities for life to exist

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for more news about weird planets in the