The tilt of our earth

river said:
https://en.m.wikipedia.org/wiki/Theia_(planet)
Click to expand...
Yes. As I said, there are competing hypotheses. All of them have problems, which is why they're competing, and none have been widely accepted.

That hypothesis provides some evidence of a head-on impact, but fails to explain the observed axial tilt. Which also fails to explain why the Moon's orbit is also aligned with Earth's axial tilt (as it would be in according to the GIH).

The alternative hypothesis is mentioned in the same wiki article I referenced:
https://en.wikipedia.org/wiki/Giant-impact_hypothesis#Modified_hypothesis
 
DaveC426913 said:
Yes. As I said, there are competing hypotheses. All of them have problems, which is why they're competing, and none have been widely accepted.

That hypothesis provides some evidence of a head-on impact, but fails to explain the observed axial tilt. Which also fails to explain why the Moon's orbit is also aligned with Earth's axial tilt (as it would be in according to the GIH).

The alternative hypothesis is mentioned in the same wiki article I referenced:
https://en.wikipedia.org/wiki/Giant-impact_hypothesis#Modified_hypothesis
Click to expand...

The Theia theory is now debunked .
 
river said:
The Theia theory is now debunked .
Click to expand...
Where did this happen?

The article you linked to mentions Theia. I'm not sure there's any theory of the early formation of the Earth-Moon system that does not predict the presence of Theia.
 
river said:
Which is debunked as nonsense .
Click to expand...
What are you talking about?
We've discussed two hypotheses, both of which incorporate Theia. Where was there any theory mentioned that does not include Theia?

You can't simply say something is debunked without actually debunking it.
 
DaveC426913 said:
What are you talking about?
We've discussed two hypotheses, both of which incorporate Theia. Where was there any theory mentioned that does not include Theia?

You can't simply say something is debunked without actually debunking it.
Click to expand...

Theia head on with Earth debunks this theory .
 
river said:
Yes I'm familar with the theory .

Don't buy it .
Click to expand...
As Dave has said, it is one among a few examples as to how our Moon came to be. Irrespective though it does not detract from the well supported observationally evidenced accretion disk theory of planetary formation.
If you don't buy it, I suggest you formulate another evidenced supported theory.
 
paddoboy said:
As Dave has said, it is one among a few examples as to how our Moon came to be. Irrespective though it does not detract from the well supported observationally evidenced accretion disk theory of planetary formation.
If you don't buy it, I suggest you formulate another evidenced supported theory.
Click to expand...

But we are discussing how the Earth is tilted .
 
river said:
But we are discussing how the Earth is tilted .
Click to expand...
Yes, as per most other bodies in the solar system. Remember it was a violent place not long after formation. Knocks and collisions were probably occurring everywhere...Venus, Uranus are two exxtremes.
 
DaveC426913 said:
Because Earth is not a perfect sphere and the Sun and Moon act on it.

"The precession of the equinoxes is caused by the gravitational forces of the Sun and the Moon, and to a lesser extent other bodies, on the Earth. It was first explained by Sir Isaac Newton.[19]

Axial precession is similar to the precession of a spinning top. In both cases, the applied force is due to gravity. For a spinning top, this force tends to be almost parallel to the rotation axis. For the Earth, however, the applied forces of the Sun and the Moon are nearly perpendicular to the axis of rotation.

The Earth is not a perfect sphere but an oblate spheroid, with an equatorial diameter about 43 kilometers larger than its polar diameter. Because of the Earth's axial tilt, during most of the year the half of this bulge that is closest to the Sun is off-center, either to the north or to the south, and the far half is off-center on the opposite side. The gravitational pull on the closer half is stronger, since gravity decreases with distance, so this creates a small torque on the Earth as the Sun pulls harder on one side of the Earth than the other. The axis of this torque is roughly perpendicular to the axis of the Earth's rotation so the axis of rotation precesses. If the Earth were a perfect sphere, there would be no precession."

https://en.wikipedia.org/wiki/Axial_precession#Cause

Or don't you "buy that" either? :smile:
Click to expand...
Well put! And he obviously won't accept that either...more spooky, more mystery, more supernatural. :D:p

On part of your description of the Earth's angular momentum, part of this is known as the Chandler Wobble.
 
river said:
Yet hard science has no clue as to why the Earth is tilted .
Click to expand...
Obviously being as ignorant as you are of scientific theories and the scientific methodology, there is really not any 100% proof in science theory. All present incumbent theories were at one time hypotheticals...hypotheticals that became accepted theories as predictions were born out, and further observations and experiments supported the model.
Again despite your obtuseness and trolling, most of the planets are tilted to some degree, and the best theory is the violent nature of the early universe.

You ignoring that on a public forum just reflects on yourself, particularly when everyone here knows of your anti science persona, and delusions of deeeeeep thinking and mystique/ That is the reality you need to face up to.
 
You must log in or register to reply here.
Back
Top