"Mira is on the right hand side, and is moving left to right. The long tail of ejected material is incredible — it’s 13 light years long! It has taken Mira 30,000 years to move this distance, which means that the material in the left hand side of the tail was ejected 30 millennia ago. If you look at the location of the star itself, you’ll see a parabolic arc in front of it; that’s the bow shock, where Mira’s ejected material is slamming into the material between stars."
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