Astronomy Picture of the Day . ... Although the spotlighted figure in white might not be identifiable by itself, surely the huge shadow behind it makes its identity clear: the space shuttle . ... While on the shuttle Crawler-Transporter , one of the largest tracked vehicles on Earth, the shuttle moved at about 2 km per hour from the main assembly building to the launch pad at NASA's Kennedy Space Center in Florida , USA. ... Publications with keywords: space shuttle Discovery - shadow - launch . ...