The first planet of extra-galactic origin in the Milky Way has been found.

第一颗起源于外星系的行星在银河系中被发现。

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In 2005, astronomers presented evidence for the first planet orbiting a binarysystem.

2005年，天文学家公布了一颗行星绕双星系统运行的证据。 发现这样的证据在历史上还是第一次。

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Astronomers claim to have discovered the first planet originating from outside our galaxy.

天文学家宣布发现了首颗来自银河系以外的行星。

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It had been the first time people moved beyond their small planet into the huge solar system.

VOA: special.2009.07.29

His first productions in hip-hop were in nineteen ninety-five in a group called Planet Hemp.

VOA: special.2009.11.25

"This valley of history has seen mankind complete its first evolutionary steps into the universe: leaving the planet Earth and going forward into the universe.

VOA: special.2010.04.28

An open source team just discovered the first planet known in a 4-sun system, just by parsing public data!

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Venus was the first planet to make an appearance, and onlookers were able to observe for themselves that Venus also goes through phases.

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This past December, for example, NASA's Kepler space telescope confirmed its first planet in the habitable zone, a "super Earth" known as Kepler-22b that's thought to be 2.4 times as wide as our planet.

MSN: Does 'potentially habitable' alien world exist? - Technology & science - Space - Space.com | NBC News