Stars and galaxies twinkle above Chile's Atacama Desert while a satellite flare zips across the night sky in this image by Petr Horálek, a photo ambassador for the European Southern Observatory. The empty landscape below has been selected to be the future site for part of the Cherenkov Telescope Array, an international project that will search the cosmos for gamma radiation using an array of 99 telescopes located in both the Southern Hemisphere and Northern Hemisphere. — Hanneke Weitering