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Star collision helps solve 16-year-old mystery of the Blue Ring Nebula – CNET

A collision between two stars thousands of years ago produced two interstellar ice cream cones full of hot gas.

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NASA/JPL-Caltech/R. Hurt
Take a moment from this hellish year to imagine that a small star has been orbiting our sun. After eons, the two stars collide. The chaotic smash leaves behind a star and a mesmerizing blue cloud of dust and gas, a nebula, spills out into the cosmos. The cloud extends to a distance of about 13 light-years, enough to engulf 10 solar systems stacked end to end. 
While such a fate doesn’t await our sun (though it is 2020, so…), that exact scenario may have occurred a few…

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