How do satellites stay in space?

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 a... Continue Reading →

Half a Percent of the Speed of Light

It would be really fast. Put your science fiction behind you. If we could use nuclear power to achieve a half of a percent of the speed of light it would be fantastic. We could reach the nearest star in 800 years! We could reach the Trappist-1 system in a mere 8000 years! Wake up... Continue Reading →

Will “Space Force” Militarize Space?

The President of the United States, Donald Trump, wants to create a new branch ​_of the military with equal but separate powers with the air-force. He calls it "Space Force." I don't think this sounds like a good idea. Are we now going to militarize space? The Internet is already producing thousands of images to... Continue Reading →

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... Continue Reading →

Why doesn’t anyone else besides me believe in time traveling?

I don’t know the answer to your question. However, consider this. We are not standing still. In time the Earth rotates around it’s axis, the Earth also rotates around the sun, the sun rotates around the galactic center and the galaxy is merging with Andromeda. We are therefore moving at hundreds of thousands of miles... Continue Reading →

Did we “accidentally” bring new bacteria to the moon or Mars via our space exploration programs?

Probably, and that’s why terraforming is a bad idea. Inside the scientifically minded community, there are two distinct ideas. Don’t contaminate. Leave whatever planet it happens to be in the original prestine condition so we can study it. (This is the predominant, tree hugging concept.) Screw number 1. Terraform the planet. Make it livable for humans,... Continue Reading →

How many satellites are there, and which are there on each planet?

If you count all the little nuts, bolts, loose wrenches and pieces of demolished satellites as satellites, then there’s a whole lot of junk floating around Earth. Thousands of pieces that pose a hazard. Around the moon we have about three functioning spacecraft but have launched far more than that that have, over time, gone... Continue Reading →

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