Mars gets hit by hundreds of basketball-size space rocks every year

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Hundreds of basketball-size space rocks slam into Mars each year, leaving behind impact craters and causing rumblings across the red planet, according to new research. Mission planners could use the revelations, recorded in data collected by a now-retired NASA mission, as they determine where to land future robotic missions as well as astronaut crews on the red planet. NASA’s InSight mission ended when the stationary lander lost a battle to...