On May 12th in the field of astronomy, one of the most significant events occurred in 1930 when the Adler Planetarium in Chicago opened its doors to the public. This was a groundbreaking moment in the history of astronomy education and public outreach.

The Adler Planetarium was the first modern planetarium in the Western Hemisphere, and it revolutionized the way people could experience and learn about the night sky. Imagine the excitement of those first visitors as they stepped into the dome and saw the stars come to life above them, even in broad daylight!

The planetarium was made possible by the generous donation of businessman Max Adler, who was inspired after visiting the Deutsches Museum in Munich and seeing their planetarium projector. He decided that Chicago needed something similar, and boy, did he deliver!

The star of the show (pun intended) was the Zeiss Model II projector, a marvel of German engineering that could accurately display 4,500 stars, along with the Sun, Moon, and planets. This mechanical wonder looked like something out of a sci-fi movie, with its dumbbell shape and intricate gears and lenses.

The opening of the Adler Planetarium sparked a planetarium boom across the United States. It became the model for dozens of other planetariums that would open in the following decades, helping to inspire generations of stargazers, astronomers, and space enthusiasts.

So, as you're reading this in 2025, take a moment to imagine those first wide-eyed visitors 95 years ago, experiencing the wonders of the cosmos in a way they never had before. And who knows? Maybe by now, we're all taking virtual reality trips to the edge of the observable universe in our living rooms. Astronomy has come a long way, but it all started with places like the Adler Planetarium making the stars accessible to everyone.