Jun 19, 2018
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.
seen from Germany
seen from Germany
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seen from Malaysia
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seen from United States
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seen from China
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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.
Why don’t these “thousands” of satellites fall back to Earth, if the likes of the ISS has to use booster rockets to stay up there? It all depends on how thick the atmosphere is where the satellite is orbiting. The atmosphere doesn’t just “end” at a certain height.
Why don’t we see the hidden face of the moon? Is this because the moon rotation is perfectly synchronized with Earth?
You are correct. The moon is synchronized with Earth, although not perfectly. There is a wobble which I’ll show you below.
The “face on the moon” means that some people see what looks like a face on the side of the moon we can see. It’s not on the far side, but the side we see.
Here is a picture of the moon with the “face” outlined that people call the “face on the moon.” It is not meant to be…
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If an intelligent species preceded us on Earth and wanted to leave a record of themselves in a time capsule, then one of the Lagrange points would be a good place for it. Is anyone looking for one there? Great question! You asked specifically if one of the Lagrange points could be a good place to hide a time capsule from the past.
How come some things can escape gravity? After all, it’s supposed to pull everything down. Maybe it is density and not gravity. It is escape velocity, once achieved, that allows us to escape. Here is an image to illustrate the point. Once you achieve escape velocity, gravity gets weaker as the ship goes outward, and it does not cause the ship to return.
Is it possible to mitigate the extreme gravity of a large planet with an appropriate orbiting space station?
Is it possible to mitigate the extreme gravity of a large planet with an appropriate orbiting space station?
Would it be possible to orbit at just the right altitude and speed to make Jupiter’s gravity ‘feel’ like earths?
In any orbit, around any planet, you’re going to be in micro-gravity. You will “feel” weightless because essentially you are falling around the planet in an orbital trajectory.
Just like astronauts on the ISS float around their space station, an astronaut orbiting…
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When in orbit, astronauts experience weightlessness. What is this caused by?
When in orbit, astronauts experience weightlessness. What is this caused by?
Astronauts are not weightless. They experience micro-gravity.
As close to the earth that they are, gravity is a huge factor. You couldn’t, for example, step outside and just float away into space.
The reason it seems to be weightlessness is that the ISS and the astronauts inside are all falling at the same speed. The forward movement causes and angular movement away from the earth and the…
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If you fire a gun vertically from the earth's surface, but there is no friction, would it return to earth?
If you fire a gun vertically from the earth’s surface, but there is no friction, would it return to earth?
Yes it would return to Earth. The escape velocity for Earth is more than 11 km per second or 33 times the speed of sound. This is about 9 or 10 times faster than a rifle bullet.
So even without air friction the bullet’s going to go up, gradually slow down, and fall.
The problem is that without friction it’s going to come down too fast and kill someone at roughly the same speed as when it left the…
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