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Q&A Rigorous Science Meta
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Rigorous Science Natural subterranean cave formations on Mars

Apparently, this was investigated by NASA in the early 2000s in what became known as The Caves of Mars Project. Its goal was to find possible places for humans to live over extended periods of time...

posted 8y ago by HDE 226868‭  ·  last activity 8y ago by HDE 226868‭

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