Alien microbes may also lurk right under our noses. Scientists can hunt for these organisms by looking for the markers of alternative biochemistry.

外星微生物也可能是安然无恙地潜藏在我们眼皮底下，科学家可以通过寻找生物化学替代物的标记寻找这些生物。

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Looking like a creature from the Alien movies, this nightmarish "longhead dreamer" anglerfish (Chaenophryne longiceps) was until recently an alien species to Greenland waters (map).

可怕的“长头梦想家”琵琶鱼看上去好似《异形》电影中的生物，是最近才在格陵兰岛水域发现的外来物种。

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But Kepler, which hunts by looking for transiting planets, has already identified more than 700 "candidates" — stars that may harbor alien planets.

通过寻找凌星行星，开普勒已经确定了700多个”候选恒星“——可能有外行星的恒星。

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As well as being able to chip in with opinions about what constitutes a planet, the team are letting students develop data mining experiments, looking for patterns that could assist in the discovery of alien life -- or just look neat when graphed visually.

ENGADGET: Alt-week 1.26.13: quadruple DNA helixes, Byzantine mutants and battling hospital bugs

The car was tiny, Continental-looking, green-colored with a lighter-green leaf stencilled on the door, as distinctively alien in the car park as Hilda had been among the shoppers inside.

NEWYORKER: She��s the One