SOLAR SYSTEM

Detailed explanation-1: -Most people can survive only a couple of minutes without oxygen, and low concentrations of oxygen can cause fatigue and blackouts. To ensure the safety of the crew, the ISS will have redundant supplies of that essential gas.

Detailed explanation-2: -Above the 63, 000-foot threshold, humans must wear spacesuits that supply oxygen for breathing and that maintain a pressure around the body to keep body fluids in the liquid state. At this altitude the total air pressure is no longer sufficient to keep body fluids from boiling.

Detailed explanation-3: -Astronauts and cosmonauts are able to split the oxygen from the hydrogen using a process called electrolysis, which involves running electricity through water.

Detailed explanation-4: -But we’re not at total recovery yet. Right now, the ISS recycles 90 percent of its water-or more than 1, 000 gallons annually-and 40 percent of the oxygen astronauts breathe. The rest comes up on resupply missions. This diagram shows how NASA gets so close to a self-sustaining space home.

Detailed explanation-5: -NASA scientists know that for humans to travel through space, astronauts have basic needs. Astronauts must have oxygen, food, water, and rest.

Detailed explanation-6: -Actually, astronauts get the oxygen that they breathe from water. As you have learned in science classes, water is made up of 2 hydrogens and 1 oxygen molecule. Scientists have found a way to break down that water into its basic molecules through a process called electrolysis.

Detailed explanation-7: -Any surface can be a floor, wall, or ceiling, and therefore astronauts can sleep anywhere. But, weak gravity means that the astronauts may gradually float away while sleeping. To keep that from happening, most astronauts on the ISS sleep by restraining their bodies in small sleeping compartments or sleeping bags.