Alex Young Mercury Transit Live Shot from NASA Goddard

From an Earth-based perspective, Mercury passes between our planet and the sun only about 13 times a century. May 9, 2016, will be the last opportunity to see the event, known as a transit, until 2019.

In this video Dr. Alex Young, of NASA's Goddard Space Flight Center in Greenbelt, Maryland, talks about the transit.

Credit: NASA's Goddard Space Flight Center