Cambridge-led CosmoCube mission to probe 'cosmic dark ages' from lunar far side
A compact satellite will use the moon as a radio shield to detect hydrogen signals from 13.5 billion years ago.
An international team led by the University of Cambridge is developing a small satellite designed to eavesdrop on the earliest whispers of the universe. The mission, known as CosmoCube, aims to study the "cosmic dark ages" by detecting faint signals emitted roughly 13.5 billion years ago.
To achieve this, the satellite will orbit the far side of the moon, utilizing the lunar mass as a physical shield to block radio interference from Earth. The spacecraft is being developed in collaboration with Surrey Space Technology Limited (SSTL) using the SSTL-21 platform, resulting in a satellite roughly the size of a small carry-on suitcase. Technically, CosmoCube will operate at extremely low frequencies between 10 and 50 MHz to detect the 21-centimeter signal from neutral hydrogen atoms.
The challenge of the dark ages
The "cosmic dark ages" refers to the period approximately 150 million years after the Big Bang, before the first stars ignited. Detecting signals from this era is nearly impossible from the ground because Earth's ionosphere blocks low-frequency waves. Furthermore, human-made radio noise from telecommunications, satellites, and FM broadcasts typically drowns out the faint cosmic signals researchers are seeking.
Professor Eloy de Lera Acedo noted that the far side of the moon is "really the only option," as it solves these interference problems simultaneously and opens a clear window into the early universe.
Scientific implications
Directly observing this era would allow scientists to understand the transition from a dark, nearly empty state to the complex structure of galaxies seen today. Specifically, the data could reveal how dark matter functioned to pull hydrogen together, eventually triggering the formation of the first stars and galaxies.
Beyond the science, the mission is notable for its efficiency. "Apart from the science, what makes our mission unique is its size," Professor de Lera Acedo said, adding that the team is probing the deepest parts of the dark ages using a compact, relatively low-cost platform.
Mission roadmap
Supported by the UK Space Agency, the project has engaged with the ESA mini-Fast Call for Ideas. The mission plan involves a two-year operation with a goal of collecting 1,000 hours of data. Due to its orbital path, the satellite expects to receive approximately 40 minutes of radio shielding during every two-hour orbit.
While the technical specifications and institutional partnerships are confirmed, the exact launch window remains a point of hope for researchers, who aim to get the satellite into space within the next five years.