- Steam power did not begin with the steam engine. Long before seventeenth-century scientists discovered the true nature of vacuums and atmospheric pressure, steam- and heat-using devices were being developed. Here we’ll explore the long, little-known story of how the steam engine evolved. And have fun playing with the ancient devices.
Astronomers have mapped the cosmic watershed in which our Milky Way Galaxy is a droplet. The massive structure, which the research team dubs the Laniakea Supercluster, extends more than 500 million light-years and contains 100,000 large galaxies.
Camille M. Carlisle, Sky and Telescope