Astronauts reflect on living aboard the International Space Station
The International Space Station is 250 miles above Earth and travels at roughly 175,000 mph as it orbits our planet. Since 2000, scientists have conducted experiments on everything from cancer to botany to fundamental questions about our universe. Horizons moderator William Brangham explores life aboard the ISS with two astronauts who worked there, Karen Nyberg and Don Pettit.
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