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NASA Can't Explain What Made This Strange, Deep Hole on Mars

• valuearb 9y ago
  Cool image. Im guessing some more alien conspiracy theories will arise from it.
  • cr0sh 9y ago
    Alien deep pit mining...?
• Black-Plaid 9y ago
  This looks like it has to be a collapse of some void below. There's no ejecta around the crater, or any of the other impact signs.
• RikNieu 9y ago
  I'm no expert, but that looks like a gas pocket of some sort ruptured, created a cavity and collapsed in on itself. Kind like those methane craters in Siberia.