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.
Mars is spinning faster and it's gradually cutting short the length of each Martian day, scientists have found.
As those measurements would suggest, the changes are subtle - but the scientists who observed them are not sure what the cause is. says such 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.lander, which operated on the surface for four years until running out of power last December.
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