See Every Bit of Outer Space We’ve Brought Back to Earth
Sample-return missions have brought piles of moon rocks, plus pieces of asteroids, comets and even the sun back to Earth. Next up is the big prize: Mars
![See Every Bit of Outer Space We’ve Brought Back to Earth](https://static.scientificamerican.com/dam/m/71834d9921d8bdc0/original/saw0424Gsci_lead.jpg?w=1200)
Sample-return missions have brought piles of moon rocks, plus pieces of asteroids, comets and even the sun back to Earth. Next up is the big prize: Mars
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