American - Scientist | -
Diamond planets truly are the most precious.
Debra Fischer
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As our sensitivity improves, we are finally seeing planets with longer orbital periods, planetary systems that look more like our solar system.
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Kepler's blown the lid off everything we know about extra-solar planets.
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Naturally, we think that finding another Earth-like planet is identifying a site that's at least friendly here for the evolution of life. The primary goal of the Kepler mission is to statistically assess the occurrence of these small terrestrial worlds.
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There may be hundreds of small seed planets - or planetesimals - which grow in the disk of matter around a star.
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It can be very hard to know the history of a particular star, but once in a while, we get lucky and find stars with chemical compositions that likely came from in-falling planets.
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Once we see stars with three times the metal content of our sun, the planet detection rate goes up to 20 per cent.
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A 'serious' scientist in 1992 or 1993 had to admit the possibility that planets were really rare, that most stars might not have planets. We've gone from there to here - where most stars have planets.
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