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


"I'm also sitting here wondering how a postage stamp sized spacecraft can, alongside all the other sensors and mission equipment house an RF transmitter capable of getting useful information back to planet earth."

I don't think they'll get far enough to worry about that. At 20% of the speed of light even a small amount of tenous gas or dust will turn the craft into high temperature plasma.

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