A Comet is not just for Christmas... Just when you had high hopes of getting your hands on the latest gizmos and trendy gadgets in time for Christmas... and Boom! You're being given a comet! Not just any comet. Comet ISON $ ($C/2012 S1$ )$. It's 4.6 billion years old! And it will pass within 40,000,000 miles of Earth.