View Single Post
Old December 4 2011, 06:22 PM   #18
YellowSubmarine
Commodore
 
YellowSubmarine's Avatar
 
Re: Most liveable alien worlds ranked

Devices that extract energy from heat are otherwise known as perpetual motion machines of the second kind. I do hope and believe we will make such at some point in the future (otherwise we are doomed), but we certainly can't make them now.
YellowSubmarine is offline   Reply With Quote