Photos and tests from the Mars Rover show an abundance of hematite, a dark red mineral that takes its name from the Greek word haima, meaning “blood.” Another mineral, goethite, is named for the German poet Johann Wolfgang von Goethe, an amateur...
A day on Mars is about 40 minutes longer than a day on Earth, so astronomers have a word for that unit of time. They call it a sol, from the Latin word for sun. NASA scientists refer to and the day before the current sol as yestersol. They tried...