Mars is spinning faster and its days are getting shorter. Scientists aren't sure why
The Doppler shift is the same effect that causes the siren of an emergency vehicle to rise in pitch as it approaches a listener before dropping again as it moves away. Similarly, whenis on the hemisphere of Mars that is rotating into view, the radio signal it emits is Doppler shifted to higher frequencies, and when InSight is on the hemisphere rotating out of view, the signal is Doppler shifted to shorter frequencies.
The experiment used data from InSight’s first 900 days on Mars, and concluded that Mars’ rotation is speeding up by 0.76 milliseconds per year – the most precise measurement of Mars’ rotation period ever made.RISE has also been doing work on the interior of the red planet, measuring the size of Mars’ molten core.
, using seismic waves from marsquakes that ripple through the planet. Now, RISE has been able to refine that measurement.The interior of Mars, like Earth, is differentiated into different layers.
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