Tiny Lunar Probe Aims to Detect Ancient Cosmic Signal from Before First Stars
The Cambridge-led CosmoCube satellite, no larger than a small suitcase, will orbit the Moon’s far side to hunt for the faint 21-centimeter hydrogen line from the universe’s dark ages before any stars lit up.
Developed by an international team headed by the University of Cambridge, the suitcase-sized CosmoCube will travel to lunar orbit and deploy a lightweight antenna to capture the 21-centimeter hydrogen line from the cosmic dark ages, a period preceding the first stars. The Moon’s far side will block Earth-originating radio noise, providing about 40 minutes of quiet per orbit, which the spacecraft will use to conduct ultra-sensitive measurements for roughly 1,000 hours over two years.
The mission will operate in the 10-50 MHz band, inaccessible from ground-based observatories, and will employ a Dicke-switch calibrator and advanced Bayesian analysis to isolate the faint signal from foreground emissions. Funding from the UK Space Agency, the Kavli Foundation and STFC supports a low-cost design using RF-SoC technology from Surrey Space Technology Limited, with partners including Portsmouth University and several EU institutions. Successful detection could reveal how dark matter influenced early structure formation and demonstrate that compact satellites can achieve breakthrough cosmological science.
Why it matters
It could finally expose the universe’s earliest hidden era and prove small satellites can unlock major cosmic mysteries.
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