[r_barton]

Only NASA would spend $1-billion dollars to send a penny to Mars. ;-)

http://www.space.com/23211-mars-rover-curiosity-penny-photo.html

http://www.space.com/17647-mars-rover-curiosity-lincoln-penny.html

http://www.nasa.gov/mission_pages/msl/news/msl20120207.html

[xzins]

So 1¢ = $1,000,000,000