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Prof Hawking to mail postage-stamp space craft to Alpha Centauri using frickin' lasers

Brewster's Angle Grinder Silver badge

"They've been able to hit mirrors on the moon as part of the Lunar Ranging Experiment since the 60s, so there's no reason why not with today's technology."

LLR targets are about ~0.5m wide. But by the time the beam reaches one, it's ~6km wide. And the amount of energy reflected is not enough to be seen by the naked eye. It's hitting it and hitting it with enough energy that's the problem.

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