By Blocking the Light From a Star, Webb Reveals the Dusty Disk Surrounding It

AU Microscopii is a small red dwarf star about 32 light-years away. It’s far too dim for the unaided human eye, but that doesn’t diminish its appeal. The star has at least two exoplanets and hosts a circumstellar debris disk. It’s also young, only about 23 million years old, and it’s the second-closest pre-main sequence …