Grabbing a bit of a comet that's racing through the solar system at 150,000 miles per hour while its spits out chunks of ice, rock and dust sounds a little tricky.
But researchers at NASA's Space Flight Centre are in the early stages of coming up with a solution - a space harpoon.
They want to send a spacecraft to meet with a comet, then fire off the harpoon they are developing to get soil samples while hovering above the target.
Using a space harpoon would allow samples to be collected from areas that are too dangerous for a spacecraft to land.
Once the samples are collected the harpoon can be reeled back to the space craft and taken back to earth for analysis.