Google has announced they are releasing the source code of Google Sky Map to the public. Google Sky Map is an Android app which users the phone's sensors to act as a window into the cosmos. Originally created by some Googlers during their famous 20% time, Sky Map allows users to point their Android device to any direction and see what starts, galaxies etc. are in that direction.
According to the announcement posted on the Google Research Blog, Google has donated the source code of the app to the public and has partnered with Carnegie Mellon University to further the development of the app.
Developers who want to look at the Sky Map source code can find it at http://code.google.com/p/stardroid/
Google Sky Map is still available on the Android Market and if you want to install it, click the link below or scan the QR code with your phone.