The Greek city of Rhodes emerged victorious from a yearlong siege by the Macedonian noble Demetrius Poliorcetes in 304 b.c. To commemorate their city’s resilience, the Rhodians built a towering bronze ...

Aerial photos of the world-renowned Colosseum and the Roman Forum reveal the impressive scale of Rome’s ancient heart. The ...

How archaeologists are rediscovering the ancient world's most marvelous monuments The canonical Seven Wonders of the Ancient World were renowned for their size or splendor and—in all cases—the ...

On the ground, its rings are hard to appreciate; dunes, heat haze, and uneven terrain all conspire to hide the full shape. But from space, especially in the images taken by the Copernicus satellite, ...

Astronomers capture the twinkle of a distant quasar, RX J1131, and reveal the secret size of a black hole's fiery corona.

Tucson-area optics firm Geost has been supplying sensor systems for U.S. defense and intelligence satellites since its founding by a University of Arizona optics Ph.D. two decades ago. Now, Geost is ...