Ben Krupowicz
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This is an image of the Black Widow Pulsar moving through our galaxy at one million kilometers per hour. That is its bow shock wave. It looks like the grim reaper to me and if it passed too close to us, it would be.

The “Black Widow” pulsar moves at a speed of KM/hr. A bow shock wave is the greenish crescent shape. The pressure behind the bow shock creates a second shock wave that sweeps the cloud of high-energy particles back from the pulsar to form the cocoon.