Caltech’s Massive Radio Array in Nevada Desert Poised to Map a Billion New Cosmic Sources

Construction will soon break ground on what scientists describe as the most powerful radio telescope ever conceived. In a remote valley north of Ely, Nevada, Caltech plans to erect 1,650 dishes. Each stands a bit over 6 meters wide. Together they will span some 20 by 16 kilometers of high desert terrain. The project, known as the Deep Synoptic Array or DSA, promises to survey the sky 100 times faster than any existing or planned instrument.

But speed tells only part of the story. The array will generate real-time images. No more amassing 100 exabytes of raw data that would demand 5 million hard drives. Instead a central supercomputer, likened to a radio camera, will process signals at 200 terabits per second. That’s on par with total U.S. internet traffic. Data pours out ready for immediate analysis by researchers and citizen scientists alike.

“We want the whole world to also have access to the data just as quickly as we do,” said Caltech astronomer Katie Jameson, lead project manager for the DSA. (Gizmodo)

The telescope builds directly on years of work at Caltech’s Owens Valley Radio Observatory. There, prototypes scaled from 10 dishes to 110 under National Science Foundation support. Those efforts already deliver more than 40 terabytes of science data daily. They detect fast radio bursts and their host galaxies at a rate of two per week. Now the Nevada site offers something Owens Valley cannot: enough open, radio-quiet land ringed by mountains to block terrestrial interference. Soil conditions suit low-impact antenna installation. Cell towers sit far away.

Schmidt Sciences, backed by Eric and Wendy Schmidt, greenlit full construction with an investment approaching $200 million. The sum places the DSA within the Eric and Wendy Schmidt Observatory System. Completion targets 2029. Science operations follow shortly after. Prototypes tested in California’s Mojave Desert already validate the design. German-made antennas from Mtex Antenna GmbH, room-temperature receivers developed by Sandy Weinreb and Steve Padin, even feed horns shaped from commercial cake pans. Optical fiber from Praxis Broadband will link every dish to the central processor. Simple. Effective. No cryogenic cooling required.

Gregg Hallinan, Caltech professor of astronomy and director of the Owens Valley facility, frames the payoff in stark terms. “While all other radio telescopes combined have so far found about 20 million radio sources, the DSA will match that in the first day of operations. By the end of its initial survey, it will have discovered about 1 billion new radio sources.” (Pasadena Now, June 11, 2026)

Such volume changes the game for radio astronomy. The array functions as a chronoscope, capturing the radio sky at 1,000 frames per second. Transient events snap into view instantly. Fast radio bursts. Pulsar glitches. Neutron star mergers. Black hole activity. Even subtle distortions in space-time itself from gravitational waves. Co-investigator Vikram Ravi notes the instrument will probe dark matter, test general relativity under extreme conditions, and trace how galaxies and supermassive black holes formed across cosmic time. (Pasadena Now)

And the data stays open. No proprietary period. Alerts stream in real time. The approach echoes the philosophy that drove earlier OVRO expansions, including the Long Wavelength Array that now counts hundreds of pyramid-shaped antennas across the California site. Those instruments scan magnetospheres of exoplanets and stars every few seconds. The DSA takes the concept to its logical extreme. One billion sources. A movie of the dynamic radio universe.

Site selection in northern Spring Valley followed exhaustive study. City of Ely officials heard detailed presentations last fall outlining why the location ranks highest in the continental U.S. Low population. Natural barriers against radio noise. Suitable geology. Environmental surveys already underway aim to minimize footprint. Construction will disturb as little as possible. The surrounding Great Basin landscape remains largely untouched.

Comparisons come easily. The Very Large Array in New Mexico deploys 27 larger dishes. Arecibo once relied on a single massive fixed reflector before its collapse. The DSA instead bets on sheer numbers of modest antennas. Their signals combine coherently. Resolution and sensitivity soar. Image quality exceeds anything prior. “This transforms radio astronomy,” Ravi said. (Pasadena Now)

Recent coverage underscores momentum. On the very day the Gizmodo story appeared, Pasadena Now reported Schmidt Sciences had formally approved the build. No delays noted. Hardware development continues apace. The project inherits techniques proven on smaller DSA-110 and OVRO-LWA arrays. Those pathfinders already deliver on fast transient detection and wide-field mapping. Scaling up by more than an order of magnitude carries risk. Yet engineers express confidence born of working prototypes.

Public engagement forms part of the plan. Caltech astronomers collaborate with the Nevada Northern Railway on the Star Train. Visitors ride into the desert for dark skies and science talks. Local events in Ely feature film screenings with telescope viewing. The observatory wants neighbors to feel ownership in the discovery machine rising nearby.

So what will the first years reveal? A catalog so vast it dwarfs all previous radio surveys combined. Maps of the cosmic web in neutral hydrogen. Traces of magnetic fields in distant galaxies. Perhaps evidence of new physics in the stretching and squeezing of spacetime. The DSA won’t stare at single objects for long integrations. It will watch everything, all the time. A constant, high-speed vigil across the heavens.

Hallinan calls the moment a renaissance for radio astronomy at Owens Valley. The Nevada extension marks its boldest chapter. Data rates will climb still higher. Processing demands will test the limits of current computing. Yet the payoff arrives daily. Real-time images. Instant alerts. Open archives. Astronomers worldwide gain eyes on the transient sky they never had before.

Challenges remain. Fiber deployment across 200 square kilometers. Power distribution. Calibration of 1,650 independent dishes. Data pipeline that ingests 200 terabits per second without collapse. None appear insurmountable. The team has solved harder problems at smaller scale. And the desert location, chosen with care, offers the quietest radio canvas in the lower 48 states.

When operations begin toward decade’s end, the DSA will stand alone. Most sensitive. Fastest surveyor. Highest quality imager. It will rewrite textbooks on the radio universe. One billion new voices from across the cosmos. Each one telling its story in real time. The mother of all deep space radio telescopes is no longer a concept. It’s becoming concrete in the Nevada high desert. And the sky will never look quite the same.