This giant telescope has scrutinized our atmosphere from a few kilometers to a thousand kilometers where it smoothly connects…

This giant telescope has scrutinized our atmosphere from a few kilometers to a thousand kilometers where it smoothly connects with interplanetary space. With its radar vision it studies the properties of planets, comets and asteroids. In our Galaxy it detects the faint pulses emitted hundreds of times per second from pulsars. And from the farthest reaches of the Universe quasars and galaxies emit radio waves which arrive at earth 100 million years later as signals so weak that they can only be detected by a giant eye like this one. 

(via https://www.naic.edu/ao/ )