For reasons unknown, the spin of Mars is speeding up.
But scientists continue to sift through the four years’ worth of data it gathered, learning more about what is deep inside the red planet.
In a paper published in June in the journal Nature, scientists working on the mission reported additional findings gleaned from tiny shifts in the frequencies of radio transmissions between Earth and InSight on Mars.
When InSight’s location on Mars was moving toward Earth, a phenomenon known as the Doppler effect compressed the radio waves slightly, shortening the wavelength and increasing the frequency.
When InSight was in motion away from the receiving antenna on Earth, the wavelength lengthened and the frequency decreased.
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Mars