Are we alone in the universe? These Mars rocks could finally give us an answer.
The Perseverance rover has found some intriguing samples on the red planet. Here's what they might reveal about the origins ...
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Vanguard 1 is the oldest satellite orbiting Earth. Scientists want to bring it home after 67 years
An emotional rescue for America came via the first U.S. artificial satellite. Explorer 1 was boosted into space by the Army ...