WMKY

Our Island Universe: Transit of Mercury

Nov 4, 2019

Credit NASA

How big is the Solar System? You can figure out the absolute size and scale using simple high school geometry. On the morning of Monday, November 11, 2019, tiny planet Mercury will cross the solar disk. Our predecessors figured out that by using the timing of the "transit of Mercury" you can deduce the Earth-Sun distance, and in turn, just how big our Solar System is. #OurIslandUniverse

Tom Polakis of Tempe AZ made this movie of a previous Mercury transit on May 9, 2016