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2007-07-17 21:13:59 · 16 answers · asked by Anonymous in Science & Mathematics Astronomy & Space

16 answers

Impact craters are the remains of collisions between an asteroid, comet, or meteorite and the Moon. These objects hit the Moon at a wide range of speeds, but average about 12 miles per second (20 kilometers per second).

The surface of the moon is scarred with millions of impact craters. There is no atmosphere on the moon to help protect it from bombardment from potential impactors (most objects from space burn up in the Earth's atmosphere). Also, there is no erosion (wind or water) and little geologic activity to wear away these craters, so they remain unchanged until another new impact changes it.

These craters range in size up to many hundreds of kilometers, but the most enormous craters have been flooded by lava, and only parts of the outline are visible. The low elevation maria (seas) have fewer craters than other areas. This is because these areas formed more recently, and have had less time to be hit.

2007-07-17 21:22:56 · answer #1 · answered by Anonymous · 2 2

Impact craters are the remains of collisions between an asteroid, comet, or meteorite and the Moon. These objects hit the Moon at a wide range of speeds, but average about 12 miles per second (20 kilometers per second).

The surface of the moon is scarred with millions of impact craters. There is no atmosphere on the moon to help protect it from bombardment from potential impactors (most objects from space burn up in the Earth's atmosphere). Also, there is no erosion (wind or water) and little geologic activity to wear away these craters, so they remain unchanged until another new impact changes it.

These craters range in size up to many hundreds of kilometers, but the most enormous craters have been flooded by lava, and only parts of the outline are visible. The low elevation maria (seas) have fewer craters than other areas. This is because these areas formed more recently, and have had less time to be hit.

2007-07-18 04:55:30 · answer #2 · answered by Anonymous · 3 1

The moon is rife with craters because of impacts with space debris over billions of years. Much of the same kinds of debris hit earth over the years as well, but the reason the moon keeps the scars in such a pristine state is because the moon has no active geologic processes like earthquakes, volcanoes and continental drift. Since the earth does have these things, as well as an atmosphere that produces weather, the crust of the earth is always changing. The surface of the earth is constantly being eroded and reborn. The moon does not have these processes so it maintains the evidence of its impacts much more vividly.

2007-07-18 04:30:13 · answer #3 · answered by RayvenWolfe 2 · 2 1

Meteors

2007-07-21 14:15:31 · answer #4 · answered by elflaeda 7 · 1 0

asteroids hurtling around our solar system sometimes collide with the moon, just as they do with the Earth, but because there is no weather and errosion to make the crators less visible (as they are on earth), you can still see them really clearly, even from Earth.

2007-07-18 04:41:38 · answer #5 · answered by Kit Fang 7 · 3 1

Meteor impacts over millions of years.

2007-07-18 20:25:23 · answer #6 · answered by Anonymous · 0 0

Flying meteors in space sometimes crash into the surface of the moon. Simple right?

2007-07-18 04:16:52 · answer #7 · answered by Karmen 2 · 2 2

meteors collided with the moon

2007-07-18 09:38:27 · answer #8 · answered by Anonymous · 1 0

Meteors,of course.

2007-07-18 06:08:47 · answer #9 · answered by Anonymous · 2 1

Meteors and other chunk of rocks bombarding its surface.

2007-07-18 04:17:26 · answer #10 · answered by stillnosheep 1 · 1 2

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