Google Earth cannot be installed with package-manager because its license doesn't allow anyone to distribute it freely. But you can still install it by following these instructions:

From Google Earth website

1. Download Google Earth from http://earth.google.com/download-earth.html
2. Right click downloaded file and select Properties
3. Select Executable check box in Permissions tab
4. Click OK button then double click (or right-click > Open) the file to run Google Earth installer
5. This will install Google Earth in your home folder and put an icon in KDE menu
6. To repair a bug in Google Earth go to the directory /home/your_username/google-earth and remove the file libcrypto.so.0.9.8

From http://pchilfe-juergens.de/PISI-Pakete/

From this site you can select and install Google Earth.

Through GooPi

1. Select and install http://paketler.pardus-linux.org/users-2008/GooPi-0.0.2-3-2.pisi
2. With the application GooPi (Pardus > Programs > System) you can automatically build .pisi-package of Google software (Picasa, Google Desktop, Google earth).
3. After selecting the applications and [Start Building Pisi](+ root password) a directory GoogleEarth-Pisi with the build .pisi-package will be placed on your Desktop.
4. You can use this package to install Google Earth (Pardus > Programs > Internet).