Space & PhysicsDecember 31, 2018
Remembering Riccardo Giacconi: A Titan of the Heroic Age of Astronomy
On the occasion of his passing, we honor a man for all seasons and an astronomer for all wavelengths
Stories by Wallace Tucker
Wallace Tucker serves as science spokesperson for the Smithsonian Astrophysical Observatory's Chandra X-ray Center. He is the author of numerous scientific papers and eight books, including The X-ray Universe, co-authored with Riccardo Giacconi.
Space & PhysicsNovember 1, 1978
Rich Clusters of Galaxies
Some 10 percent of all galaxies belong to rich clusters, systems with thousands of members embedded in hot gas. Such a cluster is a gravitational maelstrom with giant galaxies close to its center
Space & PhysicsJuly 1, 1971
Supernova Remnants
Radiation emitted by the debris left over from catastrophic stellar explosions may yield clues to many astronomical puzzles