The team believes the atmosphere is sustained by high energy particles bombarding its icy surface and kicking up atoms, molecules and ions into the atmosphere.

研究小组认为土卫五的大气环境是由高能粒子轰击土卫五冰封的表面，将土卫五表面的原子，分子和离子撞击到大气中而产生的。

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This ingenious technique which won its inventors, one of whom was Steven Chu, now America's energy secretary, a Nobel prize works by bombarding an object with laser light at a frequency just below that which it would readily absorb and re-emit if it were stationary.

ECONOMIST: An old thought experiment may soon be realised