A green
comet that will be
visible from Earth for the first time since the Ice Age appears to be undergoing unusual changes.
Comet ZTF has created excitement in recent weeks as it has hurtled towards Earth, coming close enough to the planet that it should be visible to the naked eye. It will be the first close approach for 50,000 years, and will reach its closest point on 1 February……
https://www.independent.co.uk/space/green-comet-earth-visible-ztf-nasa-b2266223.html