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id="thebody" style="defaultCaption">Announcer:
Four, three, two, with engine start, one, zero.
And liftoff of the Delta II rocket with Kepler.
Announcer: NASA's Kepler mission has discovered the first
confirmed planetary system with more than one planet transiting the same star.<p
begin="00:00:18.733" end="00:00:27.766">Announcer: The announcement of the discovery of the two
planets, Kepler 9B and 9C, is based on seven months of observations-<p begin="00:00:26.266"
end="00:00:38.533">Announcer: Of more than one hundred fifty-six thousand stars being
monitored for subtle brightness changes as part of an ongoing search for Earth-sized
planets outside our solar system,Announcer: Scientists designated
the sun-like star Kepler 9.Man: Kepler has- has found
about seven hundred candidate planets.
Several of these appear to be stars we have multiple planets going around them.
Man: But we're announcing today our first discovery
of a proven pair of planets orbiting a single star.
We know their orbital periods, we know their sizes, and we know their masses.<p begin="00:01:15.633"
end="00:01:27.300">Man: The planets are the size about Saturn, so they're quite a bit
bigger than Earth.
Maybe about three times or four times larger than the Earth.
And these planets are hot.
Man: They have orbital periods of nineteen days
and thirty-eight days, well inside the orbit of Earth.
Or Mercury, in fact.
So they're very hot, and they're certainly gas planets.Man:
The transit timing method works by having the timing of the planet- when it goes in
front of the star, the star dims.
So we measure that time, and we measure when it happens again.<p begin="00:01:45.533"
end="00:01:56.166">Man: That's the orbital period.
And if that varies a little bit, that tells us about the planets that are orbiting that
star.
Man: The discoveries are especially important because
this transit timing method allows us to confirm even smaller planets exist.
We ought to be able to confirm even Earth-sized planets exist.
So that's extremely important.Announcer: T minus ten,
nine, eight, seven, six, five, four, three, two, with engine start, one, zero.
Announcer: And liftoff of the Delta II rocket with Kepler,
on a search for planets in some way like our own.