This database combines information from the U.S. Space Track catalog and the UCS Satellite Database and presents it visually in Google Earth. It allows the user to easily display the location of individual objects or sets of objects—both active satellites and debris—around the Earth (Figure 1), as well as showing the orbit and technical information [...]
There are three versions of the Database. The complete version can be downloaded here, which is recommended to people who heard semimajor axis before. Once you have downloaded the file and installed Google Earth, you can enter the Database by double-clicking the kml file. There is another version, which does not show the semimajor axis [...]
To view Google Earth in your web browse, click the below figure and wait a moment.
A Database showing how many satellites have been depolyed world widely (or by different space agencies) each year:
A Database showing satellites past orbital maneuvers, and current orbital maneuvers: