P*****s
发帖数: 375 | 1 Plentiful planets.
Theorists think the universe is teeming with planets, but astronomers detected
the first extrasolar planet only 4 years ago. They spotted the wobbles induced
in its parent star, an indirect method that left room for skepticism. But in
1999 astronomers unequivocally confirmed the existence of exoplanets: They
caught one transiting the face of its star, significantly dimming that star's
brightness for a few hours every 3.5 days. Astronomers even sketched the
planet's characteris |
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