Stellarium is an amazing 3D planetarium software that was just ported to the PlayBook. The app is based on the open source Stellarium Linux/Windows project and does a great job of making it all touch friendly. I am not sure if the developer is associated with the Stellarium project but either way I have to say I am impressed with how this app packs the whole view of the sky into your PlayBook.

Features include:

• GPS and magnetometer(compass) support for automatic location detection and point-and-view functionality
• Asterisms and illustrations of the constellations
• Realistic Milky Way and images of nebulae including full Messier catalogue
• Azimuthal and equatorial grids
• Celestial object search, powerful zoom
• Configurable location, landscape, projections,…

If you are an astronomy buff of simply want to learn more check out Stellarium for $1.99 in App World.