“Coma,” a pandemic-themed horror movie by the director Bertrand Bonello, takes its title from one of its two cloistered characters living in France during the coronavirus lockdown. Patricia ...

When you find it, you’ve found the Coma Star Cluster. Gamma isn’t part of it, however, but rather a foreground star some 170 light-years away. The cluster is about 100 light-years more distant.