How does the rate of motion of Earth compare to the sun's rate?
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- The Sun, like most other astronomical objects (planets, asteroids, galaxies, etc.), rotates on its axis.
- Unlike Earth and other solid objects, the entire Sun doesn't rotate at the same rate. Because the Sun is not solid,
- but is instead a giant ball of gas and plasma, different parts of the Sun spin at different rates.
- We can tell how quickly the surface of the Sun is rotating by observing the motion of structures, such as sunspots, on the Sun's visible surface.
- The regions of the Sun near its equator rotate once every 25 days.
- The Sun's rotation rate decreases with increasing latitude, so that its rotation rate is slowest near its poles.
- At its poles the Sun rotates once every 36 days!
- The interior of the Sun does not spin the same way as does its surface.
- Scientists believe that the inner regions of the Sun, including the Sun's core and radiative zone, do rotate more like a solid body.
- The outer parts of the Sun, from the convective zone outward, rotate at different rates that vary with latitude.
- The boundary between the inner parts of the Sun that spin together as a whole and the outer parts that spin at different rates is called the "tachocline".
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