Radio telescopes are like ears listening to space. Usually, there's just one ear: it picks up a signal from a single tiny spot in the sky. That's slow. The Parkes telescope in Australia now has 72 ears working at once. They're cooled to liquid-helium temperatures so that the receivers' own noise doesn't drown out the faint whispers of distant galaxies.

The new system was tested on two targets: the Large Magellanic Cloud and the nearby galaxy NGC 6744. Both glow in the neutral hydrogen line — a radio wave 21 centimeters long emitted by hydrogen atoms when an electron flips its spin. Comparison with old maps showed that previous telescopes had missed vast but very diffuse gas clouds. Now they're visible.

But 72 beams bring a problem too: interference from terrestrial transmitters and background radiation can corrupt the signal. The astronomers tried new cleaning methods — three-dimensional data decomposition, similar to separating a complex cocktail into its original components. It turned out that this method preserves faint extended signals better than the old layer-by-layer approaches. This matters for future maps of hydrogen distribution in the Universe: they could let us trace how gas gathered into galaxies.

The new system at Parkes is not just an upgrade of one telescope. It's a test of technologies that will underpin future giant sky surveys. When 72 ears work simultaneously, the Universe tells its story faster and in more detail.