Astronomers have rated an asteroid as having a 1 in 75 chance of striking Mars on January 30, 2008. The asteroid, known as 2007 WD5, was discovered in late November and is similar in size to the Tunguska object that hit remote central Siberia in 1908, unleashing energy equivalent to a 15-megaton nuclear bomb thatContinue reading “On Angering the Red Planet”