Tag: exoplanets
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The Dream of Other Earths
Thirty years ago, the only planets we knew orbited our Sun. Twenty years ago, the only planets we knew orbited our Sun, or pulsars—the remains of stars much more massive than the Sun, so the systems weren’t at all like our Solar System. Today, astronomers announced the discovery of an Earth-mass planet orbiting Alpha Centauri…
Galileo's Pendulum 