The Rubin Observatory’s 10-year movie of the universe is about to ‘blow our minds,’ chief scientist says

Scientists at the Vera C. Rubin Observatory announced on Tuesday, June 30, that the Legacy Survey of Space and Time (LSST) has officially begun. Located in northern Chile, the facility will use the world’s largest digital camera to capture a 10-year timelapse of the southern sky to study dark matter and dark energy.

The 3,200-Megapixel ‘Movie’ of the Southern Sky

The Rubin Observatory is not a traditional telescope where astronomers gather to peer through a lens. Instead, it is an automated facility designed to act as a high-speed discovery machine. According to Live Science, the observatory’s car-sized LSST Camera will capture 3,200-megapixel images of the southern sky every 30 to 40 seconds. Over the next decade, these images will form a massive mosaic, effectively filming the universe in motion. This process allows scientists to play a cosmic game of “Spot the Difference.” By revisiting the same patches of sky roughly 800 times over the survey’s duration, the observatory can track changes that were previously invisible. “In a sense, we’re taking a digital color motion picture of the universe,” Tony Tyson, chief scientist of the LSST and professor of cosmology at the University of California Davis, via Live Science The scale of the operation is immense. Mashable reports that the observatory will likely observe 17 billion Milky Way stars. Each night, the facility collects approximately 10 terabytes of data—a volume comparable to the storage capacity of 10 high-capacity smartphones.

How the ‘Ocean of Stars’ Image Works

To signal the start of the survey, the observatory released an image titled “Ocean of Stars,” featuring the constellation Lupus. This image demonstrates the facility’s ability to separate individual stars from the general haze of the Milky Way, a task where older telescopes often struggled. The camera utilizes six different filters to categorize stars by color, which serves as a proxy for age and temperature:

• Blue stars: Generally hotter, heavier, and younger.
• Red stars: Typically cooler, lighter, and older.

By analyzing these colors across the southern sky, astronomers can estimate the formation timelines of different regions of the Milky Way.

The Alert System and the ‘Unknown’

The Rubin Observatory operates as a data firehose. Within two minutes of a shutter closing, the system processes the data and compares it to archival images. If the system detects something that has exploded, moved, or appeared unexpectedly, it triggers an alert. These alerts—roughly 7 million each night—are sent to “data brokers,” which are specialized systems that sort and classify information for the global scientific community. While most brokers focus on known phenomena like supernovas or asteroids, Tony Tyson told Live Science that he is most interested in the data broker that classifies findings as “unknown.” “Millions of alerts in just the last couple of months show that Rubin is up and running as a discovery machine.” Phil Marshall, deputy director of Rubin’s operations, via Mashable The open-access nature of this data is a deliberate choice. Tyson stated that he decided early on to make the data available to everyone, ensuring that the tens of trillions of observations provide enough material for researchers worldwide.

Overcoming Technical Hurdles and Satellite Interference

Photo: Mashable

The road to this launch was not immediate. Phil Marshall noted that it took 20 years of engineering and science to reach the point where the team could finally call “action” on this project. Even now, the facility is not yet at full capacity. Tyson confirmed that the team is still working through technical bugs and is “gradually increasing our sky area and image quality” over the coming months. Additionally, the observatory faces a modern challenge: the increasing presence of ultra-bright corporate satellites, which can interfere with deep-space observations.

The Hunt for Dark Matter and Dark Energy

The observatory’s overarching mission is to unmask the invisible 95% of the universe. The facility is named after astronomer Vera Rubin, whose research provided the first strong evidence for dark matter—a substance that does not interact with light and remains invisible to traditional observation. By tracking the movement and distribution of visible stars and galaxies over ten years, the LSST aims to map the influence of dark matter and dark energy on the structure of the cosmos. “My hope at this time is that we will discover something unexpected that will revolutionize astronomy. I think it’s more than a hope, I think it’s a guarantee.” Tony Tyson, chief scientist of the LSST, via Live Science Built by the U.S. National Science Foundation and the Department of Energy, the observatory sits atop Cerro Pachón in the Chilean Andes. This location was chosen for its clear, dry, and steady air, providing the optimal environment for the Simonyi Survey Telescope to execute its decade-long census of the stars.