We had a thick atomosphere of 97 persent our solar system getting that close to a planet like Venus or mercury they way and how close to the sun they may of been would be extream hot heat that would be coming of form the sun the it could burn now i don't no of we hot/heat proof suits or what not but it sure is a crazy thing but intstead of not completeing that then Nasa would need tooi send drones that would be buid for temps like that and in those certain situations.