You said "3 Chinese astronauts return to earth" I say "they never left earths atmosphere" You say "the atmosphere can be up to the moon" I say "they never left earth so that they never returned to earth" You say "The Apollo mission went to the moon, hence left earths "atmosphere" I say "How did the Apollo missions traverse the earths radiation belts ? If indeed they went to the moon ?" You say: .... How are we defining "leaving the earth, so to return" - I would agree that reaching the moon is leaving the earth and would be beyond the "atmosphere" by both our definitions. But i dont think mankind can traverse the radiation belts, so no one has ever gone to the moon. PS, blue as a predefined colour doesnt exist except through perception - its a part of the colour green, hence the illusion. Its very accurate to describe it as an illusory covering, by Allahs mercy. We are looking out into Space at all times, the world isnt covered by a "blue covering" - this illusion of safety and protection and a barrier, separate from the universe, is precisely that - illusory to the eyes. You see its NOT the visible, well known, blue sky protecting us, its the "invisible layers" that protect us. Subhanallah.