The Solar Origins of Dendrochronology
Historian George E. Webb recounts the intertwined relationship between solar physics and dendrochronology
A New Engine Sends NASA’s Dawn Spacecraft on Its Way
Dawn spacecraft's mission to Ceres is made possible by a brand new ion engine that runs off individual atoms.
Ole Rømer and the Speed of Light
In 1676, Danish astronomer Ole Rømer predicted that an eclipse of one of Jupiter’s moons would occur ten minutes later than expected. How did he know?