What does AORTHEON?

What is the orbital distance of a average satellite? WHen did John Glenn orbit earth? What is planet Venus' like? How much of the sun can you see if you were standing in the penumbra? What instrument you use today instead of the astrolabe? When was the first manned space launch? How much are rocket? When did the Montgolfier brothers invent the hot air balloon? Can we live in the sun? What location on earth most often receives rays from the sun at a direct overhead angle? What happens to stars when they explode? How do you use the word contrail in a sentence? Do meteorites crash on Saturn? Is Mercury bigger than Asia? What do you call an explanation of an observation? What is eyebrain? What were the accomplishments of the Apollo 15 mission? Why cant we see the sun when it's morning? How did the gas get in to space to make the sun? What type of microscope makes the specimen appear light on a dark background?