I like exercise ;-)<p>If we wanted a self-assembling orbital solar array to provide that much power, it would need to be almost half the surface area of the moon.<p><a href="http:&#x2F;&#x2F;www.wolframalpha.com&#x2F;input&#x2F;?i=1.5%C3%9710^18+J++%2F+81650+J%2Fm%C2%B2+in+km^2" rel="nofollow">http:&#x2F;&#x2F;www.wolframalpha.com&#x2F;input&#x2F;?i=1.5%C3%9710^18+J++%2F+8...</a>