Fri-weekly+info

​This weeks cool fact is about............

SPACE!!!!!!!!!!!!!!!!!

Space exploration is our human response to curiosity about Earth, the moon, the planets, the sun and other stars, and the galaxies. Piloted and unpiloted space vehicles venture far beyond the boundaries of Earth to collect valuable information about the universe. Human beings have visited the moon and have lived in space stations for long periods. Space exploration helps us see Earth in its true relation with the rest of the universe. Such exploration could reveal how the sun, the planets, and the stars were formed and whether life exists beyond our own world.


 * Breathing.** A piloted spacecraft must have a source of oxygen for the crew to breathe and a means of removing carbon dioxide, which the crew exhales. Piloted space vehicles use a mixture of oxygen and nitrogen similar to Earth's atmosphere at sea level. Fans circulate air through the cabin and over containers filled with pellets of a chemical called lithium hydroxide. These pellets absorb carbon dioxide from the air. Carbon dioxide can also be combined with other chemicals for disposal. Charcoal filters help control odors.

Over the years, the food available to space travelers became more appetizing. Today, astronauts enjoy ready-to-eat meals much like convenience foods on Earth. Many space vehicles have facilities for heating frozen and chilled food. Water for drinking is an important requirement for a space mission. On space shuttles, devices called //fuel cells// produce pure water as they generate electricity for the spacecraft. On long missions, water must be recycled and reused as much as possible. Dehumidifiers remove moisture from exhaled air. On space stations, this water is usually reused for washing.
 * Eating and drinking.** The food on a spacecraft must be nutritious, easy to prepare, and convenient to store. On early missions, astronauts ate //freeze-dried foods//—that is, frozen foods with the water removed. To eat, the astronauts simply mixed water into the food. Packaging consisted of plastic tubes. The astronauts used straws to add the water.