Transcript for scene 23 of the video " Black Holes, Part 6, Gravity Waves" by Rolf Witzsche  

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A collision of two stars

 It is also possible, though much more rarely, for two stars to approach each other dead center and not miss, but collide and merge into a single, larger star. A collision of two stars like our Sun, at a closing speed of 500 km per second according to the typical motion of stars in the galaxy, would take roughly one second to be accomplished. The plasma stars wouldn't explode by collision. The collision would cause some major shock effects in the plasma within and around them as they combine, which would likely cause the same type of gyrating disturbance that the gravitational wave observatories have seen.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche