Real defense needs a bigger craft to divert a large asteroid into a safe solar orbit. (spacepolitics.com)
The mission of the Solar Terrestrial Relations Observatory, scheduled for launch in 2005, is to send two identical satellites into solar orbit, one ahead of Earth and one behind. (discovermagazine.com)
Movable vanes at the sail's four corners act like rudders so operators can help it achieve and maintain a gravitationally stable solar orbit. (discovermagazine.com)