Also what determines there speed of rotation?
2006-11-13 13:37:24 · 18 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Yes they all do, for the same reason that water swirls when it goes down a plughole; conservation of angular momentum. A star starts off as a large cloud of gas and dust which clumps together under gravity. If there's even a little bit of swirling motion, as there always is, in the cloud or the water in the bath, then as it comes closer together the rotational speed increases. Similarly when a rotating ice skater brings her outstretched arms together. What determines speed of rotation? The total angular momentum of the system to begin with. Your angular momentum about an axis is equal to your speed perpendicular to that axis times your distance from it. Add that up for each particle in the cloud or water molecule in the bath and you've got total angular momentum. Two particles moving in opposite directions cancel out, but the chances of a large mass having zero net angular momentum are zilch.
2006-11-13 14:24:43 · answer #1 · answered by zee_prime 6 · 2⤊ 0⤋
The sun does indeed rotate on an axis. That is why sunspots appear to move on the sun.
One other thing to know is that the sun's rotation is wobbled because Jupiter also exerts a gravitational pull on the sun.
That is how astronomers indirectly test for the existance of planets in distant stars.
2006-11-13 21:50:19 · answer #2 · answered by diburning 3 · 2⤊ 0⤋
No, all stars do not rotate nor do they rotate in the direction of our sun. A binary star system might rotate arounds each other. But if one of the binary stars is a black hole then the mass of the black hole might just strip the star of matter then stopping the star from rotating. Or the black hole can be also with out rotation and draw the start to a stop. A red gaint reaching the end of it's life cycle might completely stop before collapesing upon it's self.
2006-11-14 01:53:10 · answer #3 · answered by G Constant 2 · 0⤊ 0⤋
Yes the sun, whole universe including all the objects whether natural of man made (in space) rotate in their own axis.
2006-11-18 12:56:31 · answer #4 · answered by rdhinakar4477 3 · 0⤊ 0⤋
Yes; but being a non-solid the period of rotation varies with latitude. Yes; all stars rotate because, all stars form by the gravitational collapse of gas. The collapsing gas forms into a rotating disk that speeds up as it gets smaller. Look up "conservation of angular momentum"
2006-11-13 21:42:47 · answer #5 · answered by lampoilman 5 · 2⤊ 0⤋
The Sun rotates around its own axis of 22.4 degrees
It revolves in itw own elliptical orbit around the spiral galaxy
2006-11-16 03:40:07 · answer #6 · answered by Santhosh S 5 · 1⤊ 0⤋
for basic knonledge:
1] Yes all celestial bodies revolve around own axix and at the same time they do rotate.
2] the speed of rotation depends on both internal factors like mass and volumes and on eternal factors like the ratio of masses and its orbital length.
2006-11-18 01:11:04 · answer #7 · answered by answering machine 1 · 0⤊ 0⤋
yes .near the equator of sun it takes 27 days to complete one rotation.but near its poles it takes 30 days to complete a rotation.the speed of rotation is dependent on the expansion of gases the sun made up of
2006-11-13 21:56:57 · answer #8 · answered by red rose 5 3 · 2⤊ 0⤋
The planets and all the stars are on axes and they revolve around the sun.
2006-11-13 21:40:03 · answer #9 · answered by me 2 · 1⤊ 0⤋
No. Sun and stars are on its steady state. it don't have the capability to revolve on an axis as some planets do.
2006-11-14 04:12:03 · answer #10 · answered by jamayan 1 · 0⤊ 1⤋