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Dr. James O'Donoghue
physicsJ
There's enough empty space in our solar system to fit every star in the galaxy within its volume 120 AU diameter gives you over 200 billion Sun's worth of volume,
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Did you know telescopes beam lasers into the sky to simulate the appearance of a star?This 'fake' star is used to understand how the atmosphere makes thing "twinkle" in real-time,
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In September 2013 a meteor with a mass of ~100s of kilograms hit the moon at 17 kilometers per *second*, producing a flash of light that lasted over 8 seconds:
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