Recent content by Xiaochao Zheng

  1. Xiaochao Zheng

    Why colonize Mars and not the Moon?

    Wow, 23 pages of replies. I am certainly late in joining this topic. Now, we are talking about the reasons based on physics, right? The sun will become a red giant at some point, and at that time Earth will be engulfed by the expanding sun (recall superman's mother planet? same will happen...
  2. Xiaochao Zheng

    Solve Proton Homework: Min Speed to Miss Lower Plate

    It says the proton comes in midway, which means y is 0.1cm, not 0.2cm
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