Word: planetoid
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Dates: during 2000-2009
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...Humans have been looking for other planets ever since astronomers first turned telescopes to the sky. But once we got beyond the nine worlds orbiting our own sun - eight actually, now that Pluto's been busted down to planetoid - we had no luck. The problem is, stars are huge, and by comparison, even big planets are tiny. Squint all you want; you're not going to see them. (See pictures of Earth from space...