The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
The National Aeronautics and Space Administration (NASA) was established by the National Aeronautics and Space Act of 1958, as amended (42 U.S.C. 2451 et seq.). The mission of the National Aeronautics and Space Administration is to pioneer the future in space exploration, scientific discovery, and aeronautics research.