What does oxygen do in the atmosphere?

What year did the Americans go into space? Clouds are formed by the cooling and condensation of in the air? What is the meaning behind the word star? Who invented the Chinese kite? Why is moon only half visible for 15 days? What force is responsible for the nebula to come together? How did the constellation canis minor get its name? Name of the first shuttle launched? Do moon phases affect moods? Why do constellations change shape? What is a sentence using the word chronos? What was neil Armstrong doing when he said in 1969 that's one small step for aman one giant leap for mankind? How far away is the next nearest star? Is Van Allen radiation dangerous? What are the 4 most known spacecrafts? Where is the space agency test ranges and launch site are located at? Imagine you are in a spaceship that is flying away from the earthdescribe what you see from your spaceship and how you feel as it moves out of the gravitational pull of the earth? What round sphere that does not give off light of its own? What cosmic accident is believed to form many irregularly shaped galaxies? How did the NASA program Effect people?