Couch Potatoes on Mars and more! - The Countdown #13

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SUBSCRIBE, future astronauts: THE TOP 5 are listed BELOW!! CLICK HERE to learn more about this week's Top 5: --------------- THE TOP 5: Couch Potatoes on Mars 100 Billion Exoplanets Amateur Discovery Asteroid Flyby A Moon for the Moon ----------------- Watch more of Scientific American's The Countdown: GET THE SPACE LAB PAPERCRAFT:

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