There are billions of stars in our galaxy. Each star has its story to tell. Each varies in terms of its mass, temperature, luminosity and size. When…… Read more "The Hertzsprung-Russell Diagram"
Juno crossed a gravitational boundary between Jupiter and the sun, and the gas giant began pulling the spacecraft in ahead of a planned July 4 arrival, NASA…… Read more "Jupiter's gravity embraces Juno spacecraft"