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Why does the moon revolve around the earth?

It just moves forward. The moon isn’t stationary. It has inertia and no atmosphere in space to slow it down. It just goes. As it moves forward, the gravity of Earth tugs on it and it falls, but because it’s moving forward it misses Earth as it falls and goes around, again and again. That’s […]

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How Big does a Moon Have to Be?

Not very big! It would just have to be natural. Not made by man! And it wouldn’t have to be there for very long either. Just long enough for it to be in orbit. The astronomical community doesn’t have a definition for moon other than it has to be a natural object. Thus captured asteroids […]

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The Little Rocket that Was

Let’s revisit Sir Isaac Newton’s cannon. In the above mentioned article we had placed a level on the cannon and shot the cannonball at 1440 feet per second parallel to the ground until it fell and bounced and rolled and came to a stop. We didn’t want to shoot it up in the air in […]

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Solution to Joe Drops the Ball

In two previous blog posts about Newton’s Cannon and Joe Drops the Ball I posed the question: If falling objects go faster and faster, why don’t orbiting objects fall out of orbit and crash to the ground? The question is legitimate and also has a perfectly legitimate explanation. The rate of a falling object is […]

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What keeps satellites in orbit?

Satellites don’t have or need engines to keep them in orbit. Once launched at their elevation and velocity, there’s very little atmosphere to slow them down. They just go. Imagine firing a bullet parallel to the ground. After the initial launch of the bullet from the explosion in the gun barrel, the bullet needs no […]

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