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Completed TRL 2 (started at 1, targeting 2)
An ultra-long-wavelength radio telescope on the far-side of the Moon has tremendous advantages compared to Earth-based and Earth-orbiting telescopes, including: (i) Such a telescope can observe the universe at wavelengths greater than 10m (i.e., frequencies below 30MHz), which are reflected by the Earth's ionosphere and are hitherto largely unexplored by humans, and (ii) the Moon acts as a physical shield that isolates the lunar-surface telescope from radio interferences/noises from Earth-based sources, ionosphere, Earth-orbiting satellites, and Sun’s radio-noise during the lunar night. We propose to deploy a 1km-diameter wire-mesh using wall-climbing DuAxel robots in a 3-5km-diameter lunar crater on the far-side, with suitable depth-to-diameter ratio, to form a spherical- cap reflector. This Lunar Crater Radio Telescope (LCRT), with 1km diameter, will be the largest filled-aperture radio telescope in the Solar System! LCRT could enable tremendous scientific discoveries in the field of cosmology by observing the early universe in the 10– 50m wavelength band (i.e., 6–30MHz frequency band), which has not been explored by humans till-date.
LCRT observes the universe in the 10-50m wavelength band (6-30MHz frequency band) which has not been explored by humans till-date. LCRT does not suffer undesirable effects plaguing other lunar-telescope concepts, like interactions between lunar-regolith and radio-waves affecting sparse dipole array concepts and thermal instability affecting lunar satellite concepts. LCRT could potentially enable tremendous scientific discoveries in the field of Cosmology, especially in the study of Dark Ages and Cosmic Dawn.
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