In a new study, scientists modeled tsunamis that may have occurred on Mars billions of years ago. They conclude deposits on Mars's northern plains may have come from asteroids slamming into a northern ocean billions of years ago, generating waves 300 meters (nearly 1,000 feet) high. The new study and the tsunami hypothesis lend support to the much-debated idea that Mars harbored a northern ocean billions of years ago. This simulation shows the propagation of the tsunami waves as a function of ti