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Can a telescope on the Moon's far side reveal how the universe began?

Yuewei Wen, Bin Yue, Yidong Xu, Furen Deng, Chen Zhang, Xuelei Chen

May 28, 2026

The universe's first billion years—before stars formed—left an imprint in 21-centimeter radio waves from neutral hydrogen. A proposed interferometer on the lunar far side could measure this "Dark Ages" signal to test whether inflation theory's predictions hold up, potentially rivaling Planck satellite constraints on how the universe expanded. The catch: thermal noise becomes crippling at high frequencies, so the array design must distribute antennas strategically to recover enough clean data.
Published as A Designer's Guide to Lunar Far-Side Interferometer Array: Power Spectrum Measurement and Cosmological Constraints from the Dark Ages arXiv:2605.29276
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