Transits of Mercury are the result of Mercury's movement between Earth and the sun. Mercury is visible as a slow - moving dot on the sun, and these transits only happen once or twice in a decade.

The latest transit happens this evening, with the next in 2019, which will be the last one until 2049! The Lafayette Science Museum Observatory is making plans to livestream the transit on its site and with NASA TV. Both are safe ways to watch the transit even if the Lafayette sky is cloudy!