![The Gregorian Dome reflector is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Rico Stock Photo - Alamy The Gregorian Dome reflector is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Rico Stock Photo - Alamy](https://c8.alamy.com/comp/2CDB3C5/the-gregorian-dome-reflector-is-suspended-490-feet-above-the-radio-telescope-dish-of-the-arecibo-observatory-in-puerto-rico-2CDB3C5.jpg)
The Gregorian Dome reflector is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Rico Stock Photo - Alamy
![The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy](https://l450v.alamy.com/450v/2ccbg56/the-gregorian-dome-reflector-and-delay-line-feed-antenna-is-suspended-490-feet-above-the-radio-telescope-dish-of-the-arecibo-observatory-in-puerto-ric-2ccbg56.jpg)
The Gregorian Dome reflector and delay line feed antenna is suspended 490 feet above the radio telescope dish of the Arecibo Observatory in Puerto Ric Stock Photo - Alamy
![Optical systems for radio telescope reflectors. (a) Prime focus, (b)... | Download Scientific Diagram Optical systems for radio telescope reflectors. (a) Prime focus, (b)... | Download Scientific Diagram](https://www.researchgate.net/publication/308744472/figure/fig1/AS:411855588741121@1475205432480/Optical-systems-for-radio-telescope-reflectors-a-Prime-focus-b-Cassegrain-c.png)