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Comet 67P/Churyomov-Gerasimenko – arguably the most-studied comet in history – has yielded a cosmic surprise: It emits molecular oxygen drawn from its nucleus.
The numerous streams in the M31 halo are currently assumed to be due to multiple minor mergers. Here we use the GADGET2 simulation code to test whether M31 could have experienced a major merger in its...
Ancient Mars wetter than we thought（图）
Ancient Mars the planet's surface a frozen wasteland
2010/1/11
Early Martian history may have involved more water on the planet's surface than was previously thought. That is according to researchers in the UK who have identified a series of geological features o...