Can't tell Cassiopeia from Orion? This nifty app can help. Using your GPS location data and smartphone compass, The Night Sky can identify the stars, constellations, planets and galaxies hovering above you. Even man-made satellites are included.
And for those night-sky enthusiasts who plan to bring along their iPhone to gaze at the heavens, the app includes a nighttime mode that casts the screen in red light. That way, you can hold the phone up to the sky and see the outlines of the constellations as they should appear in real life. For a more Carl Sagan-esque experience, turn on the sound effects — the result is both cosmic essence and outdoor symphony.