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2006-09-13 02:19:31 · 17 answers · asked by Jerica 1 in Science & Mathematics Astronomy & Space

17 answers

Because of the nature of gravity. You can think of gravity as a force that points inward toward the center of the planet so that every part of the surface is pulled evenly toward the center, resulting in a spherical shape..

2006-09-13 02:22:47 · answer #1 · answered by DidacticRogue 5 · 2 0

Well, the Moon is round! Really big objects like the Moon pull themselves into a sphere (like a ball). Small objects don't do this. So, your computer, your dog and even asteroids aren't big enough to pull their material into a ball.

The diameter of the Moon is 3,474 kilometers. The Earth's mass is 5.98 x 10^24 kilograms while the Moon's mass is 7.35 x 10^22 kilograms. That means the Earth weighs 5.90 x 10^24 more kilograms than the Moon. That means the Earth is just bigger all around! The Moon's average distance from the Earth is 384,467 kilometers. Like the rest of the solar system, the Moon is about 4 billion years old!

Scientists still don't know for sure what the inside of the Moon is like. The Moon does have a top crust which is rocky. Then comes the mantle which is also made of rock. Then there is a part that is partially molten. In the very middle of the Moon, there could be a small iron core.

No one is buried on the Moon. All of the astronauts who have visited the Moon have returned to Earth! There was a tragedy associated with the Apollo program that you might be thinking of...in 1967, three astronauts were killed because their module caught fire. They were still on the ground practicing for Apollo 1, which would have led the way to the Moon.

2006-09-13 09:28:50 · answer #2 · answered by skyeblue 5 · 1 0

As already mentioned, the moon is approximately round because of its massive gravity. Gravity makes all things roll down hill, so you would imagine that anything at the top of a hill will eventually shake its way down to the bottom. Similarly, when things are free to move in space, the most "down hill" location for them is when they configure themselves into a sphere. When in a sphere, the force of gravity is uniform everywhere. The tug on all parts of the object are the same, and so there is a natural equilibrium there.

However, the moon has very recently been shown not to be a sphere. it's bulging out on the far side away from earth. Keep in mind that the same face of the moon always faces the earth, and so you can think of the moon like a tennis ball being swung around by a string. If you spin the ball fast enough, it will start to deform and pancake so that portions of it will pull away from you as you spin it. The same thing is happening to the moon, and the moon is bulging on its far side.

2006-09-13 11:24:00 · answer #3 · answered by Ted 4 · 0 0

All celestial bodies are round. The moon, the planets, the sun, the stars. And not only are the objects circular, but they have a circular orbit around larger celestial bodies.

2006-09-13 09:27:27 · answer #4 · answered by jaike 5 · 0 0

It is due to the Moon's gravitational field.

As you'll see in other celestial bodies, anything of a certain size and bigger takes on a round shape due to the strong gravitational field.

2006-09-13 09:24:39 · answer #5 · answered by Anonymous · 1 0

If you were the size of the moon, and I hope you're not, you would be round too - gravity is the answer.

2006-09-13 09:30:13 · answer #6 · answered by litch 3 · 0 0

The moon isn't round anymore than the earth is. It's certainly more spherical than flat, but it has craters and mountains and valleys etc.

But if you're being more general... ask yourself... why is a pearl round? Same basic principal, MUCH smaller scale.

2006-09-13 09:22:56 · answer #7 · answered by barelyliterate 3 · 0 3

I suppose because that's the natural shape of any object with gravitational force against all parts of it, along with natural erosion of any hard edges that might have existed.

2006-09-13 09:22:33 · answer #8 · answered by Anonymous · 0 0

Perfectly? Sorta.

2006-09-13 09:21:31 · answer #9 · answered by What, what, what?? 6 · 0 2

So youll be amaze when you stared at it.
Have you tried it before, i dont know why but you just can't take your eyes away.
Its hypnotize!

2006-09-13 09:34:32 · answer #10 · answered by Anonymous · 0 0

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