A remote section of the Nevada desert is poised to host the world’s most sensitive radio telescope array. The project, led by the California Institute of Technology, received a green light last week after securing the necessary funding for construction. Termed the Deep Synoptic Array, this ambitious initiative involves 1,650 individual radio dishes working together to investigate supermassive black holes, pulsars, and fast radio bursts from deep space.
Unique Design and Capabilities
The uniqueness of the Deep Synoptic Array lies in its massive number of antennas, setting it apart from existing telescopes. Gregg Hallinan, a professor of astronomy at Caltech and a principal investigator for the project, emphasized its distinctiveness. Radio telescopes capture natural radio waves from stars, planets, galaxies, and various celestial bodies, enabling astronomers to analyze them for insights into structure, composition, and temperature.
Unlike optical observatories, radio telescopes do not capture images directly. Instead, they convert captured radio signals into data which can then be transformed into images. Hallinan noted that this array will surpass all previous ground-based radio telescopes, scanning the sky significantly faster and delivering the highest-quality radio images available.
Every telescope that has been built in history combined has found about 20 million radio sources. This telescope will double that in the first 24 hours.
Each dish will measure approximately 20 feet in diameter, forming an enormous array covering over 123 square miles in Nevada’s White Pine County. Currently, the project is in the permitting phase with construction likely to start next year, aiming for completion by 2029.
Types of Radio Telescopes
Ground-based radio astronomy typically employs two types of telescopes. One type involves a large single dish, like the 328-foot-wide Green Bank Telescope in West Virginia. The other type comprises an extensive array of smaller dishes, such as the Very Large Array in New Mexico with its 27-dish Y-shaped setup. While single dishes offer greater sensitivity to faint signals from far-off regions, arrays tend to produce sharper images. Hallinan believes the Deep Synoptic Array will excel in both areas.
The Array’s Capabilities and Research Goals
The Deep Synoptic Array aims to capture radio emissions from millions of cosmic objects like stars and galaxies. According to Vikram Ravi, a professor of astronomy at Caltech, the array will revolutionize radio astronomy by observing a larger volume of the universe more frequently than any previous telescope.
Researchers intend to conduct at least five sky surveys, identifying radio emission pulses for other observatories to explore further. The precise localization of these sources will allow optical, infrared, and X-ray observatories to focus on them for additional analysis.
Funding and Early Developments
Funding for the Deep Synoptic Array comes from Schmidt Sciences, established by Eric Schmidt, former CEO of Google, along with his wife, Wendy. Eric Schmidt also became CEO of Relativity Space last year, which recently received a NASA contract to deliver scientific instruments to Mars in 2028.
As a preliminary step, two prototype dishes were erected near Bishop, California, demonstrating the project’s technology. In search of an optimal site for the array, Hallinan and his team surveyed locations throughout the western U.S., focusing on areas free from radio frequency interference caused by electronic devices.
This telescope is sensitive enough to detect a cellphone as far away as the sun, so we need to try to get away from all that.
The Great Basin in Nevada emerged as an ideal location, offering natural protection from interference and being sparsely populated. Hallinan observed that White Pine County was exceptionally quiet, making it an excellent spot for radio astronomy.