A French Inventor Once Proposed a Giant Mirror to Burn a Message on Mars

When we want to leave our mark on Mars today, we simply send over a few Rovers to roll around in its red soil. But 150 years ago, scientists had very different plans for contacting the planet, including one French inventor who wanted to use the refracted light of the sun to sear a welcoming message into the Martian… » 10/16/14 2:35pm 10/16/14 2:35pm