Earth wobbles

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Earth wobbles

Postby HBS Guy » 30 Sep 2018, 13:55

https://www.livescience.com/63655-why-earth-wobbles.html

AGW, specifically melting of Greenland ice, adding to the wobble of the earths axis.
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Re: Earth wobbles

Postby pinkeye » 01 Oct 2018, 23:47

err.. I've heard that the Earth periodically changes it's axis's sss

Poles swap positions.
Seems rather extreme.. is it true?.
I don't mean in a sentient civilisation 's life span, but over galactic time scales..?
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Re: Earth wobbles

Postby HBS Guy » 02 Oct 2018, 02:23

Due to precession the axis of the earth rotates.

Now the the last ice sheets are melting there is a wobble to the axis of spin, as well as the stately Precession of the Equinoxes.

Flipping of the magnetic poles is completely different and is not related to the angle of the axis of rotation. It is thought that it may see Earth without a magnetic field around it for awhile, meaning some radiation can hit the earth that normally our magnetic field deflects away.
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Re: Earth wobbles

Postby dissilymordentroge » 24 Oct 2018, 21:53

pinkeye wrote:err.. I've heard that the Earth periodically changes it's axis's sss

Poles swap positions.
Seems rather extreme.. is it true?.
I don't mean in a sentient civilisation 's life span, but over galactic time scales..?

Yes, the earth’s poles do swap from Nth to Sth. There’s unambiguous evidence in geological specimens. Scientists have often wondered what triggers it and puzzle how it affects migrating animals & birds who use the Nth/Sth poles to navigate during the switch over.
Not to worry, much nastier effects come our way every so often from the sun and comets. Enjoy life while you can until we stuff the whole thing up ourselves which the odds seem to tell us will be sooner than any other threats we face.
https://en.wikipedia.org/wiki/Geomagnetic_reversal
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Re: Earth wobbles

Postby pinkeye » 24 Oct 2018, 23:06

well I am doing my best. :thumb
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Re: Earth wobbles

Postby fisherman » 01 Nov 2018, 10:46

Not a surprise. The Moon has its bigger problems. The trajectory of the Moon is crazy. If you look at the sky at night, you'll see that every day the moon is no a different place. It's pretty much chaotic.
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Re: Earth wobbles

Postby Sprintcyclist » 01 Nov 2018, 11:02

HBS Guy wrote:https://www.livescience.com/63655-why-earth-wobbles.html

AGW, specifically melting of Greenland ice, adding to the wobble of the earths axis.


What about all the iron ore leaving Australia going to China ?
Does that cause a weight imbalance ?
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Re: Earth wobbles

Postby HBS Guy » 01 Nov 2018, 13:22

The iron ore gets spread around as cars etc etc and shipped all over the world. Greenland ice loss is 200Gigatons, doubt the iron ore is that much.
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Re: Earth wobbles

Postby pinkeye » 01 Nov 2018, 22:40

Sprintcyclist wrote:
HBS Guy wrote:https://www.livescience.com/63655-why-earth-wobbles.html

AGW, specifically melting of Greenland ice, adding to the wobble of the earths axis.


What about all the iron ore leaving Australia going to China ?
Does that cause a weight imbalance ?


Humour. :bgrin
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