Moonstone, a moderately hard, transparent or translucent gemstone with a pearly or milky luster. Moonstone is a feldspar, either orthoclase (potassium aluminum silicate) or albite (sodium aluminum silicate). The stone is found in all continents except Africa; the best specimens are mined in Sri Lanka. It is the birthstone for June and represents health.
He was born exactly 300 years after Galileo died. He has yet to be awarded a Nobel Prize, although he was awarded a guest spot on “The Simpsons.” What else do you know (or not know) about this acclaimed physicist?
So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but we're not sure how they form and evolve.