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NASA NIAC Funds Giant Lunar Crater Telescope
(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 wallclimbing DuAxel robots in a 3-5km-diameter lunar crater on the far-side, with suitable depth-to-diameter ratio, to form a sphericalcap 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.