If you haven’t already heard, Mercury is going to transit the Sun this coming Monday! It’s like a solar eclipse, except Mercury is covering the Sun instead of the Moon.  And since Mercury is tiny and far away, it’s not so much ‘covering’ the Sun as it is passing across the face of the Sun in a barely perceptible way. The transit takes approximately 7 hours start to finish, and will occur on Monday, May 9th, 2016 from 7:12am to 2:42 pm EDT. If you miss this one, you can catch the next one in 2019.  They happen a dozen times a...