We still have a lot to learn about our planet. There are many hidden mysteries in the oceans' depths and at the frozen poles. But the biggest unsolved mysteries lie beyond Earth - space is the final frontier for modern-day explorers!
[It's expensive and dangerous to send people into space, so robots are used instead. Since 1997, for instance, robot rovers have landed on Mars and explored its surface.]
[The Cassini-Huygens mission reached the beautiful planet Saturn in July 2004. Robot probes studying its rings of ice and its moons may unlock many of the mysteries of our own planet's history.]
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