NASA's InSight Experiences its Most Powerful Marsquake so far: Magnitude 4.2, Lasting 90 Minutes

NASA's InSight lander has detected one of the most powerful and longest-lasting quakes on the Red Planet since the start of its mission. The big marsquake happened on Sept. 18 on Earth, which happened to coincide with InSight's 1,000th Martian day, or sol since it landed on Mars. The temblor is estimated to be about …