Strange, New Worlds

(Slate::Bad Astronomy) – Phil Plait:

Twenty years ago, the field of astronomy underwent a magnificent revolution.

On Oct. 6, 1995, Swiss astronomers Didier Queloz and Michel Mayor announced they had discovered a Jupiter-like planet orbiting a Sun-like star.

This new planet, called 51 Pegasi b, was a surprise. A big one! While it had about the same mass as Jupiter, it orbited its host star (51 Peg) in just four days, meaning it was on an orbit a mere 8million kilometers from the star. Compare that with Mercury, our solar system’s innermost planet, which never gets closer than about 46 million km from the Sun. …

bad_astronomy/2015/10/06/_51_pegasi_b

Hot Jupiter

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