Two North American Antennas at ALMA
![North American ALMA antennas](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeALMAMelcos_large.jpg)
These two North American 12-meter ALMA antennas were undergoing a test: observing the same object for the first time as a pair. The combined radio waves they created, called “first fringes,” showed ALMA astronomers that these two were ready for adoption into the array.
Credit: NRAO/AUI/NSF
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