Use a more appropriate launcher icon.

This is based on public-domain NASA Hubble image of Messier 81 from here
http://commons.wikimedia.org/wiki/Commons:Featured_pictures/Astronomy#mediaviewer/File:Messier_81_HST.jpg
The .png files were created with this tool:
http://romannurik.github.io/AndroidAssetStudio/icons-launcher.html

It would be better to use some image that fits better into a square.