Lorentz's most famous work is the Lorentz contraction for an object traveling at relativistic speeds, which he introduced in 1904.<ref>http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Lorentz.html</ref> This predicts that mass will increase and shorten its length at speeds approaching the [[speed of light]], and that time dilation of such a body occurs. | Lorentz's most famous work is the Lorentz contraction for an object traveling at relativistic speeds, which he introduced in 1904.<ref>http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Lorentz.html</ref> This predicts that mass will increase and shorten its length at speeds approaching the [[speed of light]], and that time dilation of such a body occurs. |