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Originally posted by billybob
there's lots of interesting rocks there. be nice to see that pic in real, honest true color.
the pentagonal nut with the hole in the middle and the gear-like rock are the more unnatural looking things to me.
looks like remains of an ancient machine scattered amongst fossils.
Originally posted by HowardRoark
Originally posted by baked
Lightning strikes cause fulgurite, which is a glassy rock formed when the heat from lightning fuses sand together.
Yes, but that begs the question: "Is there lighning on Mars?"
Even though the Martian atmosphere is only about 1% as dense as the Earth's, Martian dust storms are thought to put enough statically charged particles into the air to cause Martian lightning