James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects.
Radiation pressure in classical electromagnetism:
... it was published by James Clerk Maxwell in 1862,and proven experimentally ( 1900 - 1901)
> http://en.wikipedia.org/wiki/Solar_sail
http://3.bp.blogspot.com/-nCDH5-n3VTU/VT2AQ_J2eBI/AAAAAAAACV8/RuuDYzzBh3s/s1600/11.png
http://2.bp.blogspot.com/-C1cgolGV6r0/VUCw2IWncwI/AAAAAAAACWQ/8RhssZGNGKA/s1600/22.JPG
!
Archimedes asked about support !
http://www.mimuw.edu.pl/delta/articles/delta3/del1177.gif
ENERGY it is good ideal bearing zero friction !!!
http://1.bp.blogspot.com/-_oBxnPs5aWM/U-3RRFVAHVI/AAAAAAAAB4E/gFDtM5iC50o/s1600/CIMG3284.JPG
We can use new Discovery to start fly ( it is very similar to wing's aerodynamica Gravitation it is EM wave )
http://2.bp.blogspot.com/-tw7h9kfZcf0/VBk0W5TEt6I/AAAAAAAAB_o/aoG9y_DNPs0/s1600/CIMG3331.JPG