Neil Armstrong was the first man to walk on the moon. He was an American astronaut and engineer who studied aeronautical engineering. In space, astronauts wear pressurized space suits that weigh 130kg and cost $12 million. They eat dehydrated and packaged food to prevent floating away in the low-gravity environment, and drink powdered drinks by adding water through a special tube. Astronauts sleep by strapping themselves into seats or attaching sleeping bags to walls during space shuttle missions.