enture capitalist Yuri Milner projects what it will take for humans to expand their understanding of space. A tiny device called a StarChip, weighing less than one gram, can be paired with a LightSail to make an unmanned "nanocraft," which can go much deeper into space than humans on a chemically fueled ship. Milner says nanocrafts face several challenges today, but should be feasible within 25-30 years.

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