https://www.yahoo.com/news/everything-know-nasas-mars-ingenuity-223900705.html
"Mars' thin atmosphere, which is 99% less dense than Earth's, will make it difficult for Ingenuity to achieve enough lift to properly fly. Because of this, it has been designed to be extremely lightweight. It stands just 19 inches tall.
The helicopter has four large carbon-fiber blades, fashioned into two rotors that span about 4 feet and spin in opposite directions at about 2,400 rpm — significantly faster than typical helicopters on Earth."
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I can't wait to see how this goes!
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