NASA seeks comet 'crumbs' with a new technique
 

It's relatively trivial to spot comets, but spotting the dust they leave behind? That's no mean feat -- it's like tracking grains of fast-moving sand on a cosmic-scale beach. NASA, however, might just have a way of mapping that dust. It's developing...

https://www.engadget.com/2017/04/17/...-comet-crumbs/