Sunday, November 20, 2011

Thankful Day #8

Thankful Day #8: I am thankful for the moon, which originated with the impact of a Mars-sized proto-planet with the proto-Earth about 4.5 billion years ago. It's gravitational influence gives us ocean tides, but is also slowing down the Earth's rotation by 15 microseconds a year. So you get a little extra time each day!

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