Astronaunts have to wear space suits so they can breath when they are off the surface of the planet. They NEED the space suit to survive in places such as the moon so they could breath. They don't only need it to breath, but for temperature issues. On some planets, it's extremely hot or cold, so how could they survive on that? That's what the space suit comes in handy for. ;]
These are the suits that the astronauts wear when they travel to outer space.
space suits
They wear space suits
Space suits.
Space suits
No.
No unless you live in outer space
A space suit.
italy space suits
Space suits are worn to protect astronauts not only from the lack of air, but also from cold.
Yes, you must wear suits that were specially conformed for space conditions.
The helmets are part of their space suits. They do not normally wear space suits unless they are going outside the spacecraft. Since there is no air outside and it can be very cold or hot. They need the suits to breathe and to protect them from the heat or cold and the vacuum of space which would kill them.