POSTPONED - Astronomy Day 2020 

POSTPONED - Join us on April 4th from 1-10pm to celebrate 30 years of Hubble Space Telescope!  HST 30th anniversary logoFREE family-friendly activities, telescope observing, special talks, scale solar system tours, stomp rockets, comet labs, telescope observing, light labs, and planetarium shows focused on Hubble's discoveries. Come for an hour or two or stay all day. 

Check out the Hubble Space Telescope 3D Model from NASA's Visualization Technology Applications and Development team.

Full brochure, activities and schedule coming soon. 

Hosted by Sommers-Bausch Observatory and Fiske Planetarium. The CU Science DiscoveryBoulder Astronomy & Space Society, and International Dark-Sky Association and will also join us to provide more activities and information.

Astronomy Day 2019 Partner logos

There's always something amazing to see in the sky!

Check back for more astronomical events, including eclipses, planets at opposition, conjunctions, and new comets.SBO Open House with crowd on observing deck

Schedule a field trip, tour, or special event at SBO. 



Transit of Mercury photo from NASA JPLWe observed the Transit of Mercury on November 11, 2019 from 8-11am. 

Despite the clouds and periodic snow, we watched Mercury cross (transit) in front of the Sun. Sommers-Bausch Observatory and Fiske Planetarium hosted live events. 

Mercury appeared as a tiny dot moving across the brilliant Sun. Why was this a big deal? This astronomical rarity will only occur 14 times this century. The next transit observable in North America won’t happen until 2049. The only other planet we can see cross in front of the Sun is Venus. The last transit of Venus occurred in 2012 and the next one won’t happen until 2117.

The only safe way to view this astronomical event is through a special solar telescope or projected via a Heliostat or Sunspotter. REMEMBER! Looking at the Sun directly or through a telescope without proper protection can lead to serious and permanent vision damage.

The event was FREE! The NASA Solar Dynamics Observatory hosted a livestream from space and the National Solar Observatory hosted a livestream from CTIO in Chile too.