A space suit is a specially designed protective outfit that keeps astronauts alive in the harsh environment of space. Without Earth's atmosphere to provide air, pressure, and protection from extreme temperatures, a human would die very quickly in space. A space suit acts like a personal spacecraft, providing everything needed to survive: oxygen to breathe, pressure to keep blood and body fluids from boiling, some protection from harmful radiation, and insulation from temperatures that swing from hundreds of degrees above zero to hundreds of degrees below zero.

Space suits are incredibly complex. They contain layers of tough fabric, cooling systems with tubes of water, communication equipment, and sometimes even tiny jets for moving around during spacewalks. The helmets have gold-tinted visors to protect against the sun's intense, unfiltered light. Each suit must be perfectly sealed because even a small tear could be deadly.

Putting on a space suit takes hours and requires careful preparation. Astronauts must breathe pure oxygen beforehand to prevent dangerous bubbles from forming in their blood when the suit's pressure changes. The suits are so bulky and stiff that simple tasks become difficult: imagine trying to tie your shoes while wearing thick oven mitts and several winter coats at once. Despite these challenges, space suits make it possible for humans to venture outside spacecraft, repair satellites, build space stations, and walk on the Moon.