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four

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three

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two engine start one zero and liftoff of

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the delta ii rocket with kepler

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nasa's kepler mission has discovered the

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first confirmed planetary system with

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more than one planet transiting the same

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star

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the announcement of the discovery of the

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two planets kepler-9b and 9c

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is based on seven months of observations

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of more than 156 000 stars being

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monitored for subtle brightness changes

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as part of an ongoing search for

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earth-sized planets outside our solar

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system

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scientists designated the sun-like star

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kepler has found about 700 candidate

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planets several of these appear to be

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stars we have multiple planets going

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around them but we're announcing today

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our first discovery of

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a prove a proven pair of planets

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orbiting a single star we know their

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orbital periods we know their sizes and

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we know uh their masses

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the planets are the size about saturn so

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they're quite a bit bigger than earth

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maybe about uh three times or four times

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larger than the earth and these planets

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are hot and they have orbital periods of

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19 days and 38 days well inside the

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orbit of earth or mercury in fact so

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they're very hot and they're certainly

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gas planets

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the transit timing method works by

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having the timing of the planet when it

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goes in front of the star the star dims

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so we measure that time and we measure

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what happens again that's the orbital

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period if that varies a little bit that

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tells us about the planets that are

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orbiting that star the discovery is

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especially important because this

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transit timing method

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allows us to confirm even smaller

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planets exist we ought to be able to

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confirm even earth-sized planets exist

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so that's extremely important

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t-minus ten

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nine eight

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seven

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six

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five

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four

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three

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two engine start one zero and liftoff of

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the delta ii rocket with kepler on a

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search for planets in some way like our

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own air engine chamber pressures are