September 23, 2013 - A spacecraft that gave scientists their first peek into a comet's icy interior will explore no more, NASA said Friday.
The space agency declared an end to the Deep Impact put on a celestial fireworks display July 4, 2005, when it fired a projectile into comet Tempel 1. The high-speed impact
carved a crater and hurled a plume of debris into space, giving scientists their first glimpse of the comet's frozen primordial ingredients.
Afterward, Deep Impact journeyed toward comet Hartley 2, flying through a blizzard of ice particles and escaping unharmed. It later flew by the distant comet Garradd and also observed stars in search of Earth-size planets outside the solar system.
Before Deep Impact lost contact last month, it was studying another comet named Ison that could shine as bright as the moon when it makes a close swing by Earth
The cause of the failure was unknown, but engineers suspect the spacecraft lost control, causing its antenna and solar panels to point in the wrong direction. Without power flowing to its onboard computer, Deep Impact likely froze to death.
Deep Impact's comet adventures have changed scientists' views of comets, irregular bodies of ice and dust that orbit the sun and are leftovers from the formation of the solar system. Once thought to be similar, scientists said comets are more varied than initially realized. Comet
Tempel 1, for example, turned out to be fluffier than scientists imagined.