Henrietta Swan Leavitt (1868-1921)
Unknown to all at the time, her discovery would forever change our understanding of the universe.
Chandra Finds Relativistic Pinball
The ACIS data suggests cosmic rays come not from the birth of atoms, as originally proposed by Robert Millikan, but from the death of stars.
Apollo 7 – First Live TV Broadcast
Unfortunately, the tragedy of January 1967 may have only attracted more viewers. Interest in Apollo 7 grew more intense. And when the red light finally turned on, what a show it turned out to be!
Antikythera Mechanism
The device mimics the complexity of clockwork not designed in Western Europe until a millennium later. What did the ancient Greeks use it for?
Mariner’s Astrolabe
Who knows where the world would be today without this small, but ingeniously practical, tool!