The original plan was to fly around the Moon for the Artemis II mission, which is currently scheduled for April, and then attempt a lunar landing with Artemis III in 2028.
But questions remain about how realistic the goal and timeframe are, given recent and steep Nasa budget cuts, and some scientists are concerned that the plans are driven by geopolitical goals.
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According to Welsh legend, Prince Madoc is believed to have discovered America in 1170 after setting sail from north Wales, over 300 years before Christopher Columbus arrived.
在理想模型中，如果一台机器人月均能接十单，每单两三千元，半年左右即可回本。这种测算足以让许多人产生强烈的参与冲动。