Radar images of asteroid 1998 QE2, taken when the cosmic traveler was about 3.75 million miles from Earth, revealed that the asteroid, with a 1.7-mile diameter, has a moon or satellite revolving around it. NASA/JPL-Caltech/GSSR hide caption

itoggle caption NASA/JPL-Caltech/GSSR

The Antares rocket lifts off from the launchpad at the NASA facility on Wallops Island Va., Sunday, beginning a test mission that has now been deemed a success. The Orbital Sciences Corp. rocket will eventually deliver supplies to the International Space Station. Steve Helber/AP hide caption

itoggle caption Steve Helber/AP

Apollo 11 climbs toward orbit after liftoff on July 16, 1969. In 2 1/2 minutes of powered flight, the S-IC booster lifts the vehicle to an altitude of about 39 miles, some 55 miles downrange. NASA hide caption

itoggle caption NASA

Carnegie Lake, Australia, 1999 Carnegie Lake in Western Australia fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh. Flooded areas appear dark blue or black, vegetation appears in shades of dark and light green, and sands, soils and minerals appear in a variety of colors. NASA hide caption

itoggle caption NASA

A replica Mayan Calendar Round showing the date September 21, 2004, opening day for the Smithsonian's National Museum of the American Indian. Molly Stephey/Smithsonian's National Museum of the American Indian hide caption

itoggle caption Molly Stephey/Smithsonian's National Museum of the American Indian