Comet C/2014 Q2 (Lovejoy) in early 2015.
NASA Goddard Space Flight Center from Greenbelt, MD, USA, Public domain, via Wikimedia Commons or Flickr: https://flic.kr/p/SkWt5a
NASA Study Hints at Possible Change in Water ‘Fingerprint’ of Comet
A trip past the sun may have selectively altered the production of one form of water in a comet – an effect not seen by astronomers before, a new NASA study suggests.Flickr