- Explosion shows space travel "a really tough business," NASA official says
- Spacecraft, rocket alone cost over $200 million, Orbital Sciences exec says
- Space station crew is in good shape even without resupply, says official
- The spacecraft burst into flames seconds after liftoff; no injuries are reported
(CNN)An unmanned NASA-contracted rocket exploded in midair early Tuesday evening, producing huge flames and loud booms along the eastern Virginia coast but no injuries or deaths.