Cataclysm

Posted to the homepage on August 11, 2013. The Moon—like the sun, stars and Earth—is easy for a human being to take for granted.  But the Earth's moon is truly exceptional, and should be appreciated for shaping the exceptional world we live on.  Earth is the only planet with a single moon, and relative to the Earth, Luna is the largest moon in the solar system.  The Moon thus exerts a strong, solitary influence on the planet it was torn from.  Evidence suggests that the Moon was blown into orbit by a massive asteroid impact about 4.5 billion years ago, shortly before the emergence of life on…