NASA Discovers Mars' Rapidly Increasing Rotation Speed

NASA's InSight lander has collected data indicating that Mars is rotating more quickly than before, shortening the length of a Martian day by a fraction of a millisecond per year. The increased acceleration, about 4 milliarcseconds per year², is still being investigated, but it may be due to ice accumulation at the Martian poles or the rise of landmasses after being covered in ice. The findings, based on InSight data, suggest that Mars has a molten metal core with a radius of about 1,140 miles. Although the mission has ended, the data collected by InSight has significantly contributed to our understanding of the red planet.