The South African Radio Observatory announced a few days ago that an international team used the South African MeerKAT radio telescope to directly detect weak radio signals from neutral hydrogen gas several billion light years away, providing a new technical means for mapping the large-scale structure of the universe. Neutral hydrogen emits a weak radio signal with a wavelength of 21 cm.

The South African Radio Observatory announced a few days ago that an international team used the South African MeerKAT radio telescope to directly detect weak radio signals from neutral hydrogen gas several billion light years away, providing a new technical means for mapping the large-scale structure of the universe. Neutral hydrogen emits a weak radio signal with a wavelength of 21 cm.