The Opportunity Mars rover sent its last signal to Earth.
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A team of NASA scientists declared that the Martian ALH 84001 meteorite might contain traces of alien life.
NASA's MAVEN space probe was launched from the Cape Canaveral Air Force Station.
A large explosion above the Pacific Ocean turned out to be a meteorite.
University of California scientists found evidence that life on Earth probably began 4.1 billion years ago.
The oldest piece of Earth was found at a sheep ranch in Western Australia.
