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30th of May 2016
Milky Way above the Compact Array
Photo by Alex Cherney (Terrastro)
CSIRO's Australia Telescope Compact Array (ATCA) as photographed by Alex Cherney. The ATCA (6 x 22-m dishes) is a synthesis telescope, using Earth rotation to form a 6-km diameter radio telescope. Its five receiver systems cover the frequency range from 1.1 to 105 GHz. At the low end, we use the 1.42 GHz spectral line of hydrogen to map the atomic gas in galaxies, while at the high end we observe the spectral lines of many molecules, including red-shifted CO, which traces some of the extremely cold molecular hydrogen gas.

Photo credit: Alex Cherney (Terrastro)

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