Green Comet Not Seen Since Stone Age Reappears Above Earth

Images reveal subtle green glow that is thought to result from the presence of diatomic carbon

  • Comet C/2022 E3 is going to make its closest approach to Earth next Wednesday and Thursday.
  • The exotic green comet was calculated to orbit the sun every 50,000 years, meaning it last passed by the Earth during the time of the Neanderthals.
  • In dark, rural areas, the comet has recently become bright enough to spot with the naked eye.