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John Casey

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  1. John Casey
    To catch enough lift with so few molecules to push against, the helicopter's two pairs of blades will have to spin in opposite directions at a speed roughly eight times faster than a passenger helicopter on Earth
  2. John Casey
    Greetings to all lovers of astronomy and space. My name is John Casey I have been fond of space science since childhood and now I am studying the latest discoveries in this area. I am glad to be here as the community member and as a valuable contributor, finding new mates.
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