A historical record of Arctic sea ice based on the abundance of cosmic dust in sediments on the sea bed of the Arctic Ocean has revealed how the sea ice responds to climate warming.
Astronomy would be a lot easier if there were no clouds of gas and dust in space. There'd be no need for telescopes with the abilty to see through these thick veils. Alas, space is not only full of things we want to see, but full of things that get in the way.

