NASA says shifts in a planet s mass can cause it to accelerate - a bit like an ice skater spinning with their arms stretched out, then pulling their arms in.
Recordings of the interior of Mars have just delivered the most precise measurement of the red planet's spin yet, and the results are a confusing surprise.
Data sent by the spacecraft before it retired last December has provided new details about how fast the planet rotates and how much it wobbles. Scientists have made the most precise measurements ever of Mars’ rotation, for the first time detecting how the planet wobbles due to the “sloshing” of i