can asteroids,meteors,or comets hit earth or are they just in space?

We get hit with debris every day.

In the early solar system, the inner planets were bombarded by all kinds of objects while the planets were forming.

That bombardment appears to have ended by about 3 billion years ago.

Today, we get hit with hundreds of meteors every day. Meteors are generally small, and there are more small objects than large ones. Asteroids are generally larger and follow more stable orbits - as asteroid is much less likely to hit the Earth than meteors. And comets are also very unlikely to hit the Earth.

As you have already been told, (natural) space debris ia hitting the earth, or at least entering the earth's atmosphere, all the time. Way back when the solar system was young, this sort of thing happened far, far more than it does now - and indeed there is anow a well-accepted theory that the earth's oceans got here by exactly these events - comets colliding with the earth, and brining water with them.

Now, since these collisions have been going on for billions of years, you might wonder why it is that they are still going on. Why hasn't the earth already swept up all the debris that there is out there?

There are two main reasons. One is that some of the debris is new. Meteor showers, for example, are usual caused by dust thrown off by comets. As the comet gets near the sun, its ice boils off, and the dust it contains goes with it. Some of this dust sometimes gets swept up by the earth as it makes its way round the sun.

The other reason is that orbits change. For example, lots of asteroids get close enough to Jupiter to be affected by the giant planet's gravity - they get tweaked out of their old orbits into slightly different ones. This is called 'perturbation'. Some of these new orbits may, again, intersect with ours as we orbit the sun.

Asteroids, meteors or comets not only can hit Earth but they have been doing so for billions of years. The most recent major impact was in 1908 in Siberia where either a relatively small asteroid or comet fell.

Comet dust and small meteors fall to Earth every day, increasing Earth's mass by some 40,000 tons per year.

Asteroids and comets are normally in space, and only hit Earth very very rarely. Meteors result when small particles in space called "meteoroids" enter the Earth's atmosphere and heat it to incandescence, visible as "meteors": fast moving streaks in the night sky. If they survive to hit Erath, they are called "meteorites."

Absolutely they can hit the Earth. We've attributed some major events with impacts from meteors - the extinction of the dinosaurs, for example. In 1908, a meteor or cometary fragment exploded over Tunguska, in Russia, knocking down 400 square miles of forest. About 60,000 years ago, an iron meteor impacted in the Arizona desert, creating the Berringer Meteor Crater, nearly a mile wide and 500 feet deep.

Yes, they all can and HAVE hit Earth, but the big ones hit Earth infrequently. The small stuff usually burns up in the atmosphere and all that Earth gets on surface is the dust. TONS of debris everyday.

Watch the rerun of this weeks episode pf Meteor Men on the Science or Discovery channel this weekend.

Yes, they can and, based on geological and astronomical evidence have hit the Earth in the past and continue to do so daily (at least meteors do quite frequently -- meteors that reach the ground are called meteorites -- and are generally very small.

We get hit so often that 4 million tonnes of space dust fall to earth every year. This is commonly called a shooting star.

Yes, they can and have. Look up Meteor Crater, Arizona. In fact, check out this site, there might be one near you.

http://touristinformationdirectory.com/craters/Met...

Also look up Chicxulub crater, off the coast of Mexico, which scientists believe is responsible for the dinosaur extinctions.

they can hit earth:

smaller particles hit us every day, but they burn up in the atmosphere and craters show that larger debris have hit us in the past.