22Two interesting astronomical events put on a show together on July 27th this year. This picture shows a total lunar eclipse and Mars at opposition
.(1) The lunar is eclipse was the longest one of the 21st century. Totality lasted 1 hr 43 min, four minutes shorter than the theoretical limit of a lunar eclipse. (2) Mars was at opposition – that's when it's at its closest to Earth.
[Photo: lunar eclipse, Mars, and the Mole Antonelliana in Turin, Italy – photographed by Stefano De Rosa]