NASA: 'Cannonball' spotted on Mars isn't what it seems - CNET

NASA politely debunks a UFO enthusiast theory that the Curiosity rover found a cannonball sitting in the dust on the Red Planet.

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https://www.cnet.com/news/nasa-mars-cannonball-rover-curiosity-pebble-ufo-sightings/#ftag=CAD590a51e