Question:
What is the secret behind rotation of planets ?
Param Munde
2009-08-05 10:38:26 UTC
Why planets rotate around own axis ? why all space is curved ?where is the center of whole universe located ? i want a mathematical answer.
Ten answers:
poornakumar b
2009-08-06 07:47:02 UTC
Why planets rotate around own axis ? :

To begin with the beginning, imagine a situation where two particles get attracted and move towards each other. The probability of their traveling, so as to hit head-on is far less. At their closest they rotate around each other as a 'couple'. The others follow the general trend as they approach the couple and that is how an angular momentum is built up and an 'accretion disc', the proto-planet takes shape with angular momentum as already supplied. This is conserved in the form of axial rotation of a planet.

why all space is curved ? :

The curvature is a mathematical representation (representation of gravitational potential as a function of 3 linear variables representing 3 dimensions).

where is the center of whole universe located ? :

There is no center. Is there any center on the surface of an air filled balloon? The center is not on the surface. Whole universe is like the balloon surface.

I think all the above answers can be put in mathematical formalism (It has already been done decades ago).
2009-08-05 11:18:12 UTC
Why planets rotate around own axis ?

Because they cannot rotate around another planet's axis.



Seriously: All objects move through space, All planets move through space. As a planet moves through space, it is struck by and runs into objects. Because the planet is moving in one direction, and moving away from the opposite direction, more objects strike it on one side than the other, causing it to rotate, otherwise the angular momentum would balance out and it would not rotate.



Why all space is curved?

Gravity



Where is the center of whole universe located?

Here. Because if you took a telescope, and looked out in every direction from Earth, as far as you can, you will find you are at the center of the known universe.



I want a mathematical answer.

2 + 2 = 4
2009-08-05 10:58:17 UTC
I only have time to answer your first question. The secret behind the rotation of planets is the conservation of angular momentum. In a closed system of matter and radiation, angular momentum is a constant. When things that were big become small, the small thing must rotate faster than it did when it was bigger.



SUM[i=1 to n] { R x MV } at time=t1

is equal to

SUM[i=1 to n] { R x MV } at time=t2



Now excuse me, I must go shoot a bear that is sniffing around my moonshine still.
Irv S
2009-08-05 12:43:09 UTC
Simple as I can make it:



* Planets condensed from a cloud of smaller objects

in orbit around a common center.

Envision two such objects in orbits , one slightly farther

from the center than the other.

The inner one must moving slightly faster right?

Now let gravity draw them together.

They form a new object with an orbit between the two previous orbits,

and the difference in their velocities is preserved as rotation.

(It's called 'conservation of angular momentum').

Do this often enough and you get a rotating planet.



* 'Curved" when speaking of space/time is not the same 'curved'

that you're used to in speaking of solid objects.

Gravity and the motion of the observer "curve' space in this sense.

If you're in a gravity field, you're in 'curved' space'.

If you exist and have mass, you create your own gravity field don't you?



* The center of the universe is anywhere and everywhere.

(You may consider it to be in your navel if you so choose.)

Anywhere you take an observation space/time recedes equally

in all directions from that point as a center
2009-08-05 10:48:37 UTC
The rotation occured with simple physics when the big bang occured it sent exploded out all these elements that were in melted sun form and shot them across the universe spinning and slowly cooling. the larger ones would catch the smaller ones into there gravitational pull and they would spin around the biggest sun or star.



There can't be a center of the univers but there can be a center of all the planets and stars but it would change every day cause every galaxy is moving constantly.
?
2016-12-18 12:03:35 UTC
The stress of gravity you experience from an merchandise is desperate via mass and distance. The added you're from the centre of the mass, the fewer stress you experience via gravity. the super gravitational charm of a black hollow, working example, arsies becase the black hollow is plenty smaller than the super call that collapsed to form it which you would be able to get plenty plenty nearer to the centre of mass, and hence the centre of gravitational charm, than you need to in the previous. So enable's attempt a theory test. you have 3 planets. One is the Earth. the 2nd planet is the comparable length as Earth yet made completely of iron, and the 0.33 is the comparable length as Earth yet made completely of polystyrene packing cloth. in case you shuttle to the iron planet you will experience plenty heavier because of the fact the mass of the planet is plenty better, even in spite of the undeniable fact that the dimensions is the comparable. Converseley, in case you flow to the polystyrene foam planet you will experience plenty lighter because of the fact the mass is drastically much less. yet there's a 'genuine worldwide' occasion of this phenomenon in our own back backyard, astronomically conversing. Saturn is a gasoline great planet. It has a diameter approximately 9 circumstances that of Earth and a mass ninety 5 circumstances better than Earth's. meaning it has a plenty decrease density than Earth. in case you anticipate the comparable density, then as you advance diameter via a definite ingredient, the quantity (and hence the mass) is going up via the cube of that ingredient. this is to assert, in case you double the diameter, you will multiply the mass via 8 (2x2x2). for sure Saturn would not upload up. A 9x Earth diameter planet of the comparable density would be 729 circumstances better in mass. Saturn ought to have a plenty decrease density than Earth. Saturn is a gasoline great, so does not have a stable floor you could stand on. although, that's the convention to define the 'floor' of a gasoline great planet because of the fact the area from the centre at which the stress of the ambience is comparable to the stress of Earth's atmosphere at sea point. utilising that definition, the calculations tutor that an merchandise at Saturn's 'floor' certainly feels greater or much less the comparable stress via gravity as an merchandise on the outdoors of Earth, even in spite of the undeniable fact that the planet is plenty larger. So definite, length isn't the only ingredient influencing gravity.
manish singh
2009-08-05 11:18:45 UTC
secret behind rotation of planets is gravitational force.due to gravitation force all planets move around the sun.According to Kepler's 3 laws which states about motion of planets describes that the locus of any lighter body moving around a heavy body is ELLIPSE(1st law).planets are lighter than the sun and so they move in elliptical orbit.

According to 3rd law-T^2=c*a^3 where c=constant.
Elana
2009-08-05 10:50:40 UTC
The mathematical answer would "simply" be the gravitational formula and perhaps a recitation of Newton's laws, with a smattering of Relativity.
2009-08-06 04:52:27 UTC
It is due to gravitational force
2009-08-05 10:52:25 UTC
.


This content was originally posted on Y! Answers, a Q&A website that shut down in 2021.
Loading...