(WASHINGTON) -- Early in the original Star Wars film, there is a scene in which a restless Luke Skywalker gazes at the sunsets -- twin suns, hanging over the horizon of his home planet of Tatooine.
It was a fanciful, charming idea by filmmaker George Lucas, and it now turns out the real thing -- or something very much like it -- might actually exist. Scientists reported Thursday that they have found a planet circling two stars, about 200 light-years away from Earth. Because every sun is a star, you might well see a double sunset from that planet.
Of the 1,600 so-called exoplanets so far discovered orbiting other stars, this is the first in a nice, stable, circular orbit around a binary star system.
"The Star Wars link is striking," said Alan Boss of the Carnegie Institution for Science, who was a co-author of the study in Friday's edition of the journal Science. "The colors of the stars are a bit different from what Lucas showed, but if you could stand on that planet, you would see something pretty close to that."
The discovery was made using instruments on NASA's Kepler spacecraft, a telescope launched in 2009 to search for planets orbiting distant stars. The newly found planet, known as Kepler-16b, was much too far away to be seen directly, but the instruments were sensitive enough to detect a tiny dimming of the two stars, once every 229 Earth days, as that faraway planet passed in front of them and blocked a little of their light.
"This mission has been a lot of fun because we're discovering all sorts of stuff like this," said Nick Gautier, the Kepler project scientist at NASA's Jet Propulsion Laboratory in Pasadena, California.
Boss said, "This is just unqualified good stuff."
Kepler-16b was something of a surprise to space scientists. Many stars in the night sky are, indeed, double stars, but researchers had long debated whether they could even have planets. Gravity from the two suns would whipsaw planets in different directions, some argued, pulling them apart before they could even form.
What would it be like on Kepler-16b if we could go there? Not pleasant, Boss said. Even if they can't see it, they can calculate its size and its distance from the two stars at the center of its solar system. The planet, about as massive as Saturn, is probably a gas giant like Saturn or Jupiter, which means it probably does not have a solid surface on which one could stand. And the two stars, which circle close together, are both smaller and dimmer than our sun.
So it would be cold there -- "like a cold winter day in Antarctica," Boss said. "Not very nice."
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