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…