Science Magazine astronomy covers appreciation post
The Cosmic Background Imager (2004)
Featuring the radio interferometer located on the Chajnantor plateau in the Chilean Andes, that observed the polarization of the Cosmic Microwave Background radiation.
📷 The open dome of the 10-meter Keck Telescope on Mauna Kea, Hawaii, rotated during this time exposure, making it look transparent. Credits: R. Ressmeyer/Corbis