The inner planets were constantly bombarded by meteorites during their first 600 million years in existence.

Additional notice by the Author: This information has been created by people who believes in the freedom of information and want to share their knowledge with others. You are free to copy, distribute, and display the work created under the following conditions: ATTRIBUTON (you must give the community credit), NONCOMMERCIAL (you may not use this work for commercial purposes), NO DERIVATIVE WORKS (you may not alter, transform, or build upon this work). Any of these conditions can be waived if you get permission from informationsphere.com.