NASA's InSight lander measures one of the biggest and longest marsquakes yet

NASA's InSight lander has measured one of the biggest and longest marsquakes yet, which featured tremors of 4.2 magnitude lasting nearly an hour and a half, the space agency said. The robotic seismometre celebrated 1,000 days on the Red Planet on September 18, when it detected the largest tremor since it arrived at the Elysium Planitia in 2018. The 4.2 magnitude quake equals the largest detected so far on Mars, but on Earth that would be considered'light', with more than 10,000 earthquakes of that level detected every year, feeling like a light rumble that would make dishes shake. The lander was only able to make the measurement after efforts to clear dust from its solar panels earlier in the year - keeping the seismometre operating. The team took a counterintuitive approach to achieving this by sprinkling one solar panel with larger sand grains in the hope wind would blow it across the other panel and result in clearing enough of the dust to allow power to enter the device.