<span>Water is scarce because there are few lakes and rivers and many mountain ranges block rain from moving inland.</span>
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For one, if you look at the example questions that define the Astronomy proposal, none of them are on topic for the Space Exploration site.
Astronomy is largely an academic site about the observation and
scientific study of celestial objects. Space Exploration SE is a much
more applied site about the engineering principles and challenges of
physical space exploration.
I would not suggest mixing the two.
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According to Intellicast, it's about 77 %
Lowest at 53 % at 12.00 am
Hughest at 90 % at 10.00 am