AUGUST 13, 8:30PM. 



Discover the mysteries of our universe in this outdoor presentation!

A large portion of the universe cannot be seen by the human eye, or even with very large optical telescopes. But radio and gravity waves can be detected, helping us unravel the mysteries of space and time.

We are now exploring the universe in wavelengths well beyond the human eye and the latest non-visible schemes, using gravity waves as predicted by Albert Einstein. Only recently, have these predictions made by Einstein been proven to be true.

See what we now have come to learn

about our invisible universe!

The presenter, Steven Bellavia, is currently the principal mechanical engineer for the camera on the Vera Rubin telescope (formerly called the Large Synoptic Survey Telescope, LSST) at Brookhaven National Laboratory, where he has worked since 1992. Prior to that, Steve was doing research and engineering for the Relativistic Heavy Ion Collider and the NASA Space Radiation Laboratory. As an aerospace engineer for Grumman Aerospace with the Thermodynamics Group of the Space Division he played a key role in developing a nuclear rocket engine and with the design, fabrication, and analysis of a micro-gravity liquid droplet radiator that flew on Space Shuttle mission STS-029.

Steve has been recognized for the discovery of the Clair Obscure effect “Lunar L”, which is described in the December 2018 issue of Astronomy magazine. He is also an assistant adjunct professor of astronomy and physics at Suffolk County Community College and the Astronomy Education and Outreach Coordinator at Custer Institute and Observatory.

Following the presentation, Observatory staff will provide guided tours of the night sky (weather permitting) through the many telescopes on site, including the apochromatic Zerochromat telescope in our historic observation dome.


$5 Adult, $3 Children Under 16, Observatory Members FREE. Space is limited so register early at

A rain date for this outdoor program is scheduled for August 20 at 8:30pm. Please bring a blanket or chair to enjoy this outdoor presentation.


 Custer Observatory

Address: 1115 Main Bayview Rd., Southold, NY 11971

Phone: 631-765-2626






Group for the East End and Custer Institute and Observatory invite you to explore and learn about the North Fork’s dark skies on the beach at Sound View Greenport. Join us for this unique opportunity!

With the sand beneath your feet on the beautiful Long Island Sound, catch a glimpse of Nebulae, Galaxies and other deep sky objects visible this season in a guided tour of the night sky using powerful telescopes. In addition to learning about our universe, hear about the amazing local wildlife that we share our night skies with and how we can help protect them. From owls to bats to moths, the night comes alive!


Custer Institute and Observatory is Long Island’s oldest public observatory (est. 1927), located on Main Bayview Rd in Southold, beneath some of Long Island’s darkest skies. Group for the East End is a local environmental organization focused on education, advocacy and conservation of Long Island’s East End.


$15 Adult, $8 Children 12 and Under. Space is limited, so register early at All proceeds benefit Custer Institute and Group for the East End.  

To learn more about these two organizations visit and


 Location: Sound View Greenport

Address: 58775 County Road 48, Greenport, NY 11944

Phone: 631-765-2626



ON-GOING: Custer Observatory is open to the public for stargazing and tours every Saturday from 8pm until midnight. Staff provide guided tours of the night sky through powerful telescopes (weather permitting). Suggested donation: $5 Adults, $3 Children under 12.



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