NASA's InSight mission data throws groundbreaking light about speed of rotation of Mars

New insights from NASA's InSight lander shed light on Mars' changing rotation rate, indicating that the red planet is now rotating more swiftly than in the past. InSight, a spacecraft no longer in operation, was equipped with a suite of tools, including antennas and the Rotation and Interior Structure Experiment (RISE) radio transponder. These instruments diligently tracked Mars' rotation during the first 900 days of its mission. By analyzing the accumulated data, astronomers have discerned that Mars' rotation is accelerating at a rate of approximately 4 milliarcseconds per year². This acceleration translates to a minuscule reduction in the length of a Martian day, shortening it by a fraction of a millisecond annually. For context, a day on Mars is roughly 40 minutes lengthier than an Earth day. Researchers employed the Deep Space Network to transmit signals to InSight's RISE instrument, which subsequently bounced the signal back to Earth. This communication method facilitated the tracking of subtle frequency shifts caused by the Doppler effect, akin to how the pitch of a siren alters based on its proximity. These frequency changes were found to correlate with Mars' changing rotation pattern.