Sky's the limit: Your chance to buy a piece of the moon 

Besides the moon itself, this meteorite is the largest lunar sphere known. It could be yours for $300,000-$500,000

This lunar sphere carries an estimate of $300,000-$500,000.

With a diameter of just four inches this is, besides the moon itself, the largest lunar sphere known. 

Fashioned from a lunar meteorite, it is on offer at Deep Impact: Lunar and Rare Meteorites online at Christie's New York until August 25.