What does the kuiper belt smell like?

Answer 1

It will smell like the inside of your space helmet. If you were to remove your helmet, it would smell like nothing at all, as you died of anoxia and explosive decompression.

We've never been to the Kuiper belt, and at the current rate, aren't likely to get there for another couple of centuries. When we bring space rocks from the Kuiper belt aboard our spacecraft, they are likely to smell a little like ammonia and formaldehyde, two hydrocarbon chemicals which have been detected in comets and in clouds in space.