The Titan explorer, for example, will be studying a place that - in a crude way, at least - resembles the early planet Earth at a time when life arose here.

比如说土卫六探索号将会用到至少是原始的方法来研究同早期行星——地球出现生命时情况相似的地方。

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At the same time, images obtained from Mars orbit revealed the early planet to be more Earth-like, with a broad range of surface environments suitable for life.

同时，从火星轨道上获得的照片显示，早期星球非常类似地球，有很很多地方适合生命。

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In Earth's early days, all over the planet countless photosynthetic bacteria performed photosynthesis.

在地球早期，整个星球上有无数的光合细菌在进行光合作用。

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If it holds up, the latest finding would be one of the first direct observations of the very early stages of a planet's birth.

WSJ: Possible New Planet Spotted Under Formation

It has long been thought that the lunar body resulted from an impact between the early Earth and another planet-sized object 4.5 billion years ago.

BBC: Moon formation: New spins put on old questions

Scientists made the discovery first by pinpointing their target through infrared images from the Canada-France-Hawaii Telescope, and later using the Very Large Telescope to deduce that the object was both too small to be a star as well as hot and young enough (752F and under 120 million years old) to fit the behavior of a planet orphaned early into its existence.

ENGADGET: University of Montreal detects an orbitless planet, shows that stars don't have an iron grip (video)