Crab Nebula. The pulsar and supernova remnant in Taurus dubbed the Crab Nebula — imaged here from Dayton, Ohio, on Jan. 7, 2020 — spans some 11 light-years. The central pulsar of this object rapidly spins, causing its pulse waves to sweep past Earth 33 times per second. However, though stunning when imaged using advanced equipment, beginning observers with modest scopes will likely be disappointed.