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Could we exit our solar system, and enter another? Astrophysicist Philip Lubin discusses the awesome potential of using lasers to propel small spacecraft, enabling humanity's first interstellar missions.
Roughly 85 percent of mass in the universe is "dark matter" -- mysterious material that can't be directly observed but has an immense influence on the cosmos. What exactly is this strange stuff, and what does it have to do with our existence?
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