The Heart lies near the Apollo 15 landing site, roughly between crater Archimedes and the Hadley Rille (or Rima Hadley) — so close that astronauts David Scott and James Irwin could have waved to it.

The thousand-year-old manuscript contains the earliest surviving writings by Archimedes, a Greek thinker who is regarded as the greatest mathematician of antiquity. The story of the 174-page ...

Ahead of Valentine's Day, prepare to be dazzled by the lunar heart, created by the interplay of light and shadow on our Moon.