December 1: 3I ATLAS-Tails of an Interstellar Comet; Comet 3I/ATLAS shows familiar chemistry, dust and tails, suggesting our Solar System is typical. The green-coma comet passed the Sun in October and nears Earth in mid-December before leaving forever. (Image: Victor Sabet & Julien De Winter/NASA) December 2: M77-Spiral Galaxy with an Active Center; M77, a nearby 47-million-light-year spiral galaxy, hosts a bright active core powered by a supermassive black hole. Hubble reveals its dust-lined arms and young blue star clusters circling the luminous centre. (Image: Canva)