Lone Mercury Likely Survived Multiple Mantle-Stripping Impacts

At age 24, George Ellery Hale revolutionized solar observations with his invention of the spectroheliograph, making it possible to photograph the sun's prominences in full daylight. A spectroheliograph can tune-in to gases such as hydrogen and calcium, and photograph specific solar details

Ask Ethan: What Does A Black Hole’s Size Tell Us?

Scientists Finally Uncovered a Major Efficiency Flaw Holding Back Solar Cells