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Why does Jupiter spin so quick?

July 28, 2024
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Why does Jupiter spin so quick?
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Why that is the case, and the way you really measure “spin” on a gasoline big like Jupiter, is an fascinating query, one thing that scientists have solely just lately been capable of grapple because of outcomes from a NASA spacecraft orbiting Jupiter, referred to as Juno.

Rotation, rotation, rotation

Measuring spin on a gasoline big like Jupiter in comparison with a rocky planet like Earth is just a little tough. “It’s not like you possibly can take a look at the floor,” mentioned Ravit Helled on the College of Zurich in Switzerland. Jupiter is almost entirely composed of hydrogen and helium, an enormous gaseous ball spinning in house. So how do we all know how briskly it’s really spinning?

We calculate this by learning the planet’s magnetic subject. Measuring the planet’s radio emissions, we are able to work out the spin of its inner magnetic subject, in flip giving us the spin of the planet. “We’re discovering periodicities within the magnetic fields,” mentioned Helled. This identical approach permits us to measure the spins of the opposite gasoline giants, too.

Juno, which entered orbit round Jupiter in 2016, additionally used gravitational measurements to find out how Jupiter spins. The spacecraft has proven that the winds within the planet’s outer environment prolong down about 3,000 kilometers (1,900 miles) into the planet. “For many years it was not identified if the winds penetrate very deep into the inside,” mentioned Helled, a member of the Juno science workforce. “Due to Juno we might constrain the depth. Now we imagine under 3,000 kilometers, the planet reaches uniform rotation.”

Spinning up

The place Jupiter will get this rotation price from is one other essential query, and the reply would possibly once more lie within the planet’s magnetic fields. When the planet first shaped 4.6 billion years in the past, it accrued mass from the disk of fabric across the younger Solar. Because it grew in dimension it could have spun sooner and sooner as its angular momentum elevated, like a spinning ice skater drawing of their arms.





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