2023-08-08 15:04:29
Updated Tuesday, August 8, 2023 – 15:04
According to NASA, this is due to the accumulation of ice on the polar caps and represents a reduction of a fraction of a millisecond per year.
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Marte is reducing the length of its days due to the acceleration of its turnover rate, according to data obtained by the InSight module of the NASA before the end of his mission last December.
In addition, the scientists in charge of said laboratory that is located on the surface of the Red planet have made more precise measurements of the rotation of Mars, detecting for the first time that the planet wobbles due to the “splashing” of its molten metal core.
To track the rate of spin of the planet, the study authors have relied on a radio transponder and antennae collectively called Interior Structure and Rotation Experiment, or RISE. They found that the planet’s rotation is accelerating by about 4 milliarcseconds per year, corresponding to a reduction in the length of the Martian day by a fraction of a millisecond per year.
It’s a subtle acceleration, and scientists aren’t entirely sure why. But they have some ideas, including the Ice accumulation in the polar caps or postglacial rebound, where land masses rise up after being buried by ice. The change in a planet’s mass can cause it to speed up a bit like an ice skater spinning with its arms outstretched and then retracting them, NASA explains.
The study authors have also used the RISE data to measure the wobble of Mars, called its nutation, due to the splash in its liquid core. The measurement allows scientists to determine the size of the core: according to the RISE data, the core has a radius of about 1,835 kilometers.
The authors then compared that figure to two previous measurements of the core derived from the spacecraft’s seismometer. specifically, observed how seismic waves traveled through the interior of the planeteither reflecting off the core or passing through it unimpeded.
Taking all three measurements into account, they estimate that the radius of the nucleus is between 1,790 and 1,850 kilometers. Mars as a whole has a radius of 3,390 kilometers, about half the size of Earth.
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