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Number 10:  THE MOON

 

 

 

 

 

It's still hard to believe we have men who have walked on it.  240,000 miles from Earth.  When full, it lights the night.  It has inspired lots of poets.  Billions of us have gazed at it and wondered.  It has traveled an unimagined amount of time around the Earth by its inertia and the gravity between us.

Men used to think everything rotated around the Earth.  Men still think the moon does.

 

 

 

 

 

 

 

 

If we could stand on the moon and look at Earth, we might realize that the Earth also travels around the moon.  The truth is, they each travel around the center of gravity for the pair.  That center is nearer the Earth because of its size compared with the moon.  If both were the same size, they would rotate about a point midway between them.  The Earth lights the moon's night.  That's a real photograph of the sliver silver Earth.  From 240,000 miles away, Earth would look much like a bigger moon.  Because of it's four times larger diameter, it would present about sixteen times the surface area.  The night on the moon with a full Earth in the sky would be, for all practical purposes, just like daytime.  Imagine 16 full moons here - wouldn't that be a bright night?

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