The most fascinating thing about your travels through the galaxy hasn't been the various planets you have visited; instead it is simply the view through the window of your spaceship.

在银河系航行当中最激动人心的地方不是你到访过的行星，而是那透过飞船舷窗中所看到的景色。

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That plethora allows astronomers to start drawing conclusions about how common various sorts of planets are.

ECONOMIST: Another Earth?

Since 1994, researchers have confirmed the existence of more than 700 planets circling various stars, with more than 2, 000 additional candidates under study by astronomers around the world.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate

Since 1994, researchers have confirmed the existence of more than 700 planets around various stars, with more than 2, 000 additional candidates currently under study by astronomers around the world.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate