Did earth migrate in from the outer solar system?

It is doubtful because the collision that formed the earth and moon were traced to the asteroid zone from the current orbit of earth.

Mercury may have had water and Venus did, but it has since evaporated. We know that Mars was wet and it is theorized that most of our water was delivered by comets so there are several reasons why your theory doesn't hold up; sorry about that.

Giant impact theory: http://en.wikipedia.org/wiki/Geology_of_the_Moon#G...

Most of the comets that carried earths water were delivered during the Late Heavy Bombardment period which occurred approximately 4 billion years ago, 500–600 million years after the formation of the Solar System (http://en.wikipedia.org/wiki/Formation_and_evoluti...

Your theory is not impossible, or even all that unlikely, it is just more likely that the Earth formed in the area where it currently exists. But that is based on our current model for our solar system and the discovery of giant exo-solar planets so close to their star has made us rethink the planetary migration theory. Maybe the moons of Jupiter formed closer to the Sun say in the asteroid belt and were captured by Jupiter. Then the majority of of the early water would have been closer to the sun. That theory is just as likely and equally hard to prove.

Probably not, as rocky planets tend to be closer to the sun and gaseous ones further out. This is because the solar wind, which is stronger closer to the sun, has a tendency to strip lighter elements like hydrogen and helium away from the inner planets.

But who knows, there is a lot we don't know about planet formation. Astrophysicists were convinced that gas giants couldn't form near a star for the above reasons. But when we started detecting extrasolar planets in the last ten years or so, many have turned up in very tight orbits with their stars.

I'm going with bob on this one. It is believed by many that the earth was once a large molten planet that collided with another smaller object when the solar system was forming, which created the moon. Hopefully someone out there can remember the names of those early objects better than I do. I read somewhere that one of the outer planets actually formed between Jupiter and Saturn and then moved out. It was either Uranus or Neptune. They used computer models to show it.

It's possible, but not likely. The earth fits much better in the inner solar system than in the outer. The inner (inside the asteroid belt) are "terrestrial" and the outer are gas.

You do mention something quite interesting though and that is the size of earth's moon. We would not be the same without it.

As far as water goes, that has more to do with the earth's ability to RETAIN it versus it's ability to collect it.

HTH.

Many (maybe even all) of the planets in the Solar System could have migrated in some distance due to drag by interplanetary dust. However, there is no reason to think that the Earth has migrated in significantly more than any of the other planets. The reason it has so much liquid water on its surface while the other planets of the inner Solar System don't is because it is within the right temperature range to retain liquid water and has a thick enough atmosphere and enough gravity that the water vapor doesn't just escape into space. Venus and Mercury have lower gravitational accelerations and are hot enough so that the water vapor tends to escape into space, while Mars has a very thin atmosphere and lower gravity so the water either escapes or freezes into ice. Mars actually does have a fair amount of water ice frozen in its polar regions, what it lacks is large amounts of liquid water.

Earth was made in OUR solar system. Our moon was made by a mars sized planet hit earth. And a bunch of Earth material flew off and formed into the moon and when the Earth and the new moon cooled off. Then a bunch of comets were hitting earth and burning up in the atmosphere and water gas formed in the atmosphere and rain was made this happened for millions of years and is still happening, sometimes.

maybe Earth was from the andromeda galaxy. collision might of caused Earth to have water, 0

2