This is how the transit of Mercury in front of the Sun looked through a hydrogen-alpha solar telescope in St. Petersburg, on May 9, 2016. The transit of Mercury in front of the Sun was first observed by astronomers in 1631. The next time the event will be on November 11, 2019.

Photo: Dmitry Lovetsky / AP Photo / East News

New and best

102

394

741
823

Read more