Planetary Parade: See Five Planets Line Up In The Night Sky This Week

Second 'Giant Hole' Appears on Sun: Solar Winds to Hit Earth This Week

In 1868 Pierre Janssen watched the moon pass in front of the Sun. Using a special prism, he became obsessed with a line of yellow light that everyone assumed was sodium so he kept studying that mysterious line. Joseph Lockyer worked on the same problem and both are credited for helium

How, When And Where To See A Rare Conjunction Of Venus And Uranus After Sunset This Week