Why The Rotation.

[malagabob]

So after the “Big Bang “. Matter and gas was flung out in all directions. The Earth and other planets stars were formed by the early rotation of matter and gasses. But what set up the rotations in the first place.

[Old_Geezer]

Grivity would be my guess. Things naturally swirl down the plughole: why not around a gravity well ? Good question though.

[dannyk13]

God burped?

[malagabob]

But don’t you need mass to achieve gravity OG.

[Old_Geezer]

The dust provides plenty of mass. But recall at the BB matter as we know it as lumps of stuff hadn't formed, if I recall correctly. All the bits had to sort themself out first and the parts of atoms come together. So swirling would occur after all that had occurred.

[dannyk13]

Bob, in all seriousness, I don't think this question will ever be answered satifactorily.

[jim360]

//So after the “Big Bang “. Matter and gas was flung out in all directions. //

It wasn't, though. Space expanded, and the matter followed it, but there wasn't a "great flinging out" of matter and gas.

As to the actual question, I don't think the rotations need to be "set up". They would emerge naturally from, say, some matter coalescing, and other matter nearby travelling merrily on its way but getting caught in the gravity well and following the inevitably curved path (that or joining the "central" mass).

I don't think the rotation needs to be "set up", then. It really would just be a consequence of the basic laws of physics.

(PS: danny, ye of little faith...)

[ToraToraTora]

"The Earth and other planets stars were formed by the early rotation of matter" - err no, our current solar system is formed around a second generation star, ie it needed dead 1st gen stars to make the heavy elements. Rotations is formed by ever increasing small collisions coalescing matter into clumps eventually enough matter is present it ignite a star. Matter tends to exaggerate any rotation when it increases density.

[douglas9401]

"It really would just be a consequence of the basic laws of physics."

As illustrated by this documentary footage:

[CrapAtCryptics]

if there was a big bang then, with our current understanding, there must have been something present to cause it. So what matter was it and what was its inherent rotation and gravitational fields.
Probably unanswerable but was the Big Bang not the beginning as most explosions need constituents.

[Old_Geezer]

No "thing" needed to cause it. It'd be a natural result of having nothing.

[Watson123]

The axis of rotation is different from the magnetic poles. This difference creates force for the earth to rotate on its axis. The same is the case with all planets in the Solar System. Moon doesn't have Magnetic field; hence it does not rotate on its axis.

[jim360]

Doesn't the Moon rotate on its axis, though? Taking 28 days to do so (hence why we only ever see one side of the Moon from Earth).

[Zacs-Master]

It does Jim. There’s an awful lot of twaddle being written on this thread.

[Zacs-Master]

How do we explain Cenus spinning contra to the rest of the bodies in the solar system?

[Zacs-Master]

Venus

[jim360]

I'd have to look that up. A quick google suggests that "we don't know yet", but that's hardly definitive.

[Zacs-Master]

The rotation seems to have been created because matter was not distributed evenly after the B.B.
https://www.scientificamerican.com/article/what-causes-objects-such/

[ToraToraTora]

"How do we explain Cenus spinning contra to the rest of the bodies in the solar system? " - One theory is that it's actually upside down, possibly due to a collision with a large body, Venus could be the amalgamated debris, it also spins very slowly which would be likely in that case. (A day on Venus is longer than a year)

[Zacs-Master]

Nice one Tora. There’s no upside down in space tho.

[Old_Geezer]

You may define one relative to the other planets.