This year's Android Developer Challenge showed off an enormous variety of complex applications that let users play guitar, learn about astronomy, get information on famous art or even chase down ghosts. We've picked out the 12 coolest apps.
Celeste
Developer: Terminal Eleven LLC
Function: Educational
Price: $1.99 (£1.21)

Astronomy buffs should love this augmented reality app, which uses GPS locations to determine the current locations of the sun, moon and the major planets, even if they're currently obscured from your view.
You can get the estimated times for when the moon and sun will rise and set, as well as the trajectories that planets will take across the sky.
And because the app is augmented reality, you'll get to see pictures of Saturn and Jupiter on your phone.
A World of Photo
Developer: Michael Elsdörfer
Function: Social networking
Price: Free

This is an interesting social networking game that lets you 'spin' your phone until it picks out a random fellow user from somewhere around the globe.
Once that user has been chosen, you can request that they either send you a picture of themselves or of their immediate surroundings.
The point of the game, if there is one, seems to be to make contact with as many different people in as many diverse locations in the world.
Now if only someone could sign up Kevin Bacon to play...
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Comments
JohnL said: I dont know how you can possibly get away with that title You have picked 12 apps that probably no one downloads or uses let alone has heard of Makes the whole article a farce and shows media bull at its worst If you want to use that title then at least check to see what is popular and what is downloaded and dont pick a pile of poop that some lazy idiot has decided is the best