“Observations from radio telescopes also show that the wobble has diminished in recent years; the two may be linked.”
While the Earth appears to be suddenly slowing down, it is also moving further away from the Sun.
According to NASA, the Earth is on average about 150 million kilometers away from the giant fiery ball of flames, spinning around in an elliptical orbit.
However, the average distance between Earth and the sun has been slowly increasing over time, particularly as the Sun loses mass.
Nuclear fusion, which involve converting mass into energy, is what powers the Sun.
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Article source: https://www.express.co.uk/news/science/1651808/science-news-earth-rotation-mystery-wobbles-further-sun-spinning-faster-nasa