Artist's concept of astronaut working on Mars
<ul><li>NASA wants to send humans to Mars 15 to 20 years from now. Future Mars explorers could uncover evidence that life has existed – or even might exist now – on Mars, answering one of the most basic questions humans have of the universe. A fleet of robotic spacecraft and rovers already are on and around Mars, dramatically increasing our knowledge about the Mars and paving the way for future human explorers.</li></ul>
NASA
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