Source - NASA Science News for Nov. 15, 2013
On Nov. 18-19, two comets (ISON and Encke) are going to fly by the planet Mercury in quick succession. NASA's MESSENGER spacecraft will have a front-row seat for the rare double encounter.
The complete article can be found here: http://science.nasa.gov/
A companion video is posted below and can also be viewed at: http://www.youtube.com/watch?
License: Standard YouTube License