I won’t be able to stop crying when the two Mars rovers, Spirit and Opportunity, finally stop working (which might be soon due to the martian winter). I am getting too emotional about them because they have served the mankind so incredibly much. They were supposed to stop working within 90 days of their landing, and here we are 2+ years later, still working fulltime for us. They have exceeded their lifespan and their original targets by an incredible lot. I just hope that in the future, when man is able to land in Mars with ease, they go find them, collect them and put them in a museum. These rovers are heroes!