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You live here, but how well do you really know Earth? Earth's core is hotter than the surface of the sun, about 10,800 degrees Fahrenheit. Oxygen in our atmosphere? Think ancient cyanobacteria. Over 2 billion years ago, these microbes kickstarted the Great Oxidation Event, transforming Earth's air. Earth isn't a perfect sphere. It's slightly squashed at the poles and bulges at the equator, like a squished basketball. At the equator, Earth spins at about 1,037 mph. That's faster than a commercial jet. Earth's magnetic field acts like a giant shield, protecting us from harmful solar and cosmic radiation. What did you know already? Like and subscribe for more science and space videos.

You live here, but how well do you really know Earth? Earth's core is hotter than the surface of the sun, about 10,800 degrees Fahrenheit. Oxygen in our atmosp…