ALMA antennas

ALMA antennas are the most accurate ever built and can capture radio waves from millions and millions of light-years away (even from near the Big Bang!). In this image we see in the foreground the disk of an antenna 12 meters in diameter, with its aluminum panels directing the light captured towards the sub-reflector, which concentrates the signals and redirects them to the antenna receivers. © Sergio Otárola - ALMA (ESO / NAOJ / NRAO)