Posted Jul 06, 2006 at 05:54AM by Anna S.
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Celestial Bodies
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Webster Cash,
coronagraph
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"We would use the starshade as a giant hand to suppress the light emanating from a central star by a factor of about 10 billion," says Cash. He likens the coronagraph to an outfielder holding up one hand to block the sun and get a better view of the ball he is about to catch. This device is not an entirely new concept. It has and is being used by Sun-watchers for a while now. They block out the main light from the sun giving them a good view of its surrounding. But conventional coronagraphs tend to have light spread out causing a bleeding around the edges. However, the proposed model eliminates this problem by diffracting the light away from the area close to the star, thus, giving us a crystal clear view. Because the technology needed to make this project into a reality is available, an excited Cash said, "We will be able to study Earth-like planets tens of trillions of miles away and chemically analyze their atmospheres for signs of life." |
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