What is the closest satellite to the moon?

Does Jupiter make its own light? What is the name of Carl Sagan's short story about man kind using up the universe and in the end a computer says let there be light? What is Stereopsis? Surface pressure on Mars? Correct term for the halo of light around a comet? How can you tell that some stars are relatively close to us in the sky? Which planets are next to the moon? How many hours do astronauts usually get in space? How long until the sun blows up? Where can one apply at NASA to go to the moon? Can a rocket traveling at orbital velocity reach the moon? The sun looks like a ball of fire what is it actually? What happens if a nuclear weapon explodes in space? Where does Apollo spend most of his time in the myths? When was the first foil balloon made? What would the temperature be like in June? What movement of air inside a storm cloud causes parts of the cloud to become what? Brightist planet view from the earth? What happened in space in 1942? Theories for day and night?