New images from NASA's Lunar Reconnaissance Orbiter 
(LRO) spacecraft show the moon's crust is being stretched, forming 
minute valleys in a few small areas on the lunar surface. Scientists 
propose this geologic activity occurred less than 50 million years 
ago, which is considered recent compared to the moon's age of more 
than 4.5 billion years. 

Another app for the beginner, novice or even expert astronomer is Planets.  Using its built in compass, the planet app helps you identify which planets are visible.