NASA Running Out of Non-Life Explanations for What Its Rover Found on Mars
Long-chain alkanes in ancient Martian lakebed mud likely require biological sources because non-biological processes cannot explain their inferred original concentrations.
This Photo of Mars at Night Is Straight Up Haunting
Martian nights average about 12 hours and are extremely cold, but Curiosity's LED-equipped instruments illuminate shadowed rock interiors for scientific study.