The theory supposes the existence of life on other planets.

这个理论假定其他行星存在生命。

《牛津词典》

The UFOs, it is believed, must contain scientists from other planets who are studying life on earth.

人们相信，这些不明飞行物中一定有来自其他星球的科学家，他们正在研究地球上的生命。

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The absence of oxygen on other planets means that those planets lack an ozone shield to protect life forms against UV radiation.

其他行星上没有氧气，这意味着这些行星缺乏保护生命体免受紫外线辐射的臭氧层。

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We will also tell about a historic record of rainy seasons in Asia, and the search for life on other planets.

VOA: special.2010.05.25

Or Venus? Or on any of the other planets either inside or outside our solar system?

VOA: special.2010.05.25

If some of the basic building blocks of life could be replaced with other elements, that would dramatically expand the types of environments on other planets that might support life.

FORBES: New Science Papers Prove NASA Failed Big Time In Promoting Supposedly Earth-Shaking Discovery That Wasn't

Finding microbes in the frigid, dark waters of the lake could help scientists better understand the origins of life on our own planet and the potential environments in which it could arise on other planets.

MSN: Mission to drill into buried Antarctic lake hits a snag

Planets, on the other hand, will be richer in heavy elements than the star they orbit, since there were fewer light elements left over by the time they formed.

ECONOMIST: Twinkle, twinkle, giant planet