Earth, sun, moon: three objects in space whose transmitions have a pretty huge impact on our inhabits. Earth orbits the sun once a year, and it rotates on its axis about once a day (depfinishing on your definition of “rotate”). This gives us the night-day sequence and the ypunctual cycle of the seasons.
The moon’s gravitational tug shapes the tides. On a monthly cycle, we can also see the phases of the moon, which are caused by the relative positions of these three orbs. A filled moon originates it possible to see at night. Before electric airys, this was a huge deal.
You can see how these transmitions set up our whole idea of time. So if you were writing a science textbook, you’d want to join an illustration of the Earth-sun-moon system, right? But guess what, you can’t. The distances and branch offences in size originate it wisely impossible.
Let’s say we want to erect a model of the sun and Earth alone. Earth has a radius of about 6,371 kilometers (3,959 miles), but let’s recurrent this with a marble 1 centimeter in diameter. To hold leangs in scale, I’d have to use a huge beach ball for the sun—the benevolent people knock around at rock concerts—more than a meter in diameter. You could fit 1.3 million marbles into it.
But postpone! It gets worse. That beach ball would also have to be 117 meters away. That’s lengthyer than a football field. Now try to get a picture of the ball and the marble. Good luck with that.
Modeling the Earth and moon would be easier. If we use that marble for the moon, Earth would be a tennis ball, with a diameter of 6.7 centimeters. Now for the fun part. How far apart do you leank we should put them? Take a guess. You’ll probably be wrong because we never see the Earth and moon together. The answer is 2 meters. Here’s what that would see appreciate:
Illustration: Rhett Allain
