Galactic Collision! - The Countdown #23
SUBSCRIBE, future astronauts:
LINKS for the TOP 5 are listed BELOW!!
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Printing Pizza for Astronauts
Magnetar Glitch
Opportunity Breaks a Record
Kepler’s Flywheel Woes
A Galactic Collision
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Watch more of The Countdown:
Visit Scientific American’s website for more space news:
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