NASA's InSight lander has picked up a gentle rumble on Mars, believed to be the first "marsquake" ever detected. InSight's quake monitor recorded and measured the faint signal April 6, and scientists announced the finding Tuesday. While the rumble sounds like soft wind, scientists believe it came from within the red planet. InSight is NASA's first robotic lander dedicated to studying the deep interior of Mars. (NASA/JPL-Caltech/Associated Press)Researchers are still analyzing the data, as well as three other even fainter seismic signals detected since mid-March.

Source: CBC News April 23, 2019 21:56 UTC