Why do we use machines to explore space?

Answer 1

The only solid planets are earth mars venus and Mercury. People cannot go to mars because of the gases on the planet. it would kill you. its atmosphere also wouldnot let you breathe because it cannot sustain oxygen. So we send machines to mars so that we can get information on the soil and its landdscapes. The machines sent to mars are powred by solar energy. What scientist are thinking is that mars was just like earth. They think that they also used fossil fuels and broke down there ozone layer and burned the whole planet. The soil on the surface of mars contains H2o so this tells us that there is a high possibility that water was used to be on this planet. They can also tell because mars has polar icecaps. There are also big kind of like round holes inside mars. So these probaly could have been oceans once. Earth one day could possibly end up like mars. To learn more go to mars.com. -- entry by Noah L. 12 years old