More cool astronomy, this time from Nasa's Image of the Day gallery. The border between the outgoing stellar wind from young star LL Ori and gas evaporating from the vast Orion Nebula (if you hold out your hand at arms length against the night sky, that's a pretty good approximation of the subjective extent of that complex from our point of view) create a shock wave at their boundary, anologous to a 3D version of the wave formed at the bow of boat when it moves independently of the current.
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