Why Does an Astronaut Need a Spacesuit?
A spacesuit enables an astronaut to survive by providing him artificially with conditions like those he is used to on Earth. These condition
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Atmosphere
Who Invented the Jet Engine?
The first flight by a jet-propelled aircraft was made in Germany on august 27, 1939. Its engine was designed by Hans-Joachim von Ohain, who
What Is a Meteorite?
What Is a Meteorite? Meteorites begin as bodies of matter traveling at great speed through space. In the solar system there are numberless s
When Do Plants Breathe?
When Do Plants Breathe? Technically, plants don’t breathe. But plants do respire. Like animals, they use oxygen in the process of breaking
What Is Photosynthesis?
What Is Photosynthesis? Photosynthesis is the process by which green plants make food for themselves-and, indirectly, for all animals, inclu