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Well, back when Steve O'Meara first visually sighted Halley's comet through a 60cm (24 inch) telescope back in 1985 (the first person to do so since its previous return), he did so at high altitude (on Mauna Kea in Hawaii) while breathing bottled oxygen. At the time, Halley was about 19th magnitude.
Moral of the story - fresh air is better for you!
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