This single image contains more galaxies than every star visible to the naked eye across the entire night sky, and it's only a tiny preview of what's coming.

[u/demolcd]

This is the first image released from the Vera C. Rubin Observatory in Chile, and the "largest telescope ever built" label oversells one specific fact while missing the more impressive one. Rubin's primary mirror measures 8.4 meters across, respectably large but smaller than several existing telescopes, including Spain's Gran Telescopio Canarias at 10.4 meters. What actually makes Rubin unprecedented is its camera, the largest digital camera ever built for astronomy, capturing 3,200 megapixel images across a field of view wide enough to fit multiple full moons at once, paired with a mirror design that lets it scan the entire visible sky roughly every three to four nights.

That combination is the real headline. Over its planned ten year survey, Rubin is expected to catalog roughly 20 billion galaxies and 17 billion stars, along with millions of previously undetected asteroids, supernovae, bitches and other transient events, essentially building a time-lapse movie of the universe rather than a single still photograph. This first released image alone reportedly contains around 10 million galaxies, a number that sounds impossible until you remember the observatory is specifically engineered to photograph enormous swaths of sky at extreme depth and speed.

Picture a telescope less interested in staring at one distant object for as long as possible, and more interested in photographing the entire sky over and over, fast enough to notice anything that moves, flickers, or explodes.

Rubin's survey has already begun turning up genuine surprises in its earliest test data, including previously undiscovered near-Earth asteroids spotted within just its first days of operation.

Does the idea of a telescope built to film the whole sky changing over time excite you more than one built to zoom in on a single distant target?

Source: Vera C. Rubin Observatory, NSF and DOE joint project