Re: Europa and energy transfer

Liste des GroupesRevenir à s physics 
Sujet : Re: Europa and energy transfer
De : jimp (at) *nospam* gonzo.specsol.net (Jim Pennino)
Groupes : sci.physics
Date : 01. Nov 2024, 01:24:59
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <pnjdvk-2v7h.ln1@gonzo.specsol.net>
References : 1 2 3 4 5 6 7
User-Agent : tin/2.6.2-20220130 ("Convalmore") (Linux/5.15.0-124-lowlatency (x86_64))
bertietaylor <bertietaylor@myyahoo.com> wrote:
On Thu, 31 Oct 2024 14:27:05 +0000, Jim Pennino wrote:
 
Bertietaylor <bertietaylor@myyahoo.com> wrote:
On Thu, 31 Oct 2024 0:27:40 +0000, Jim Pennino wrote:
>
bertietaylor <bertietaylor@myyahoo.com> wrote:
On Wed, 30 Oct 2024 22:05:55 +0000, x wrote:
>
On 10/29/24 21:53, Sylvia Else wrote:
NASA has a mission to the Jovian system, to study Europa. That moon is
interesting because it appears to have liquid water under an icy
surface. The heat need to keep the water liquid comes from the
stretching and compression Europa experiences during its orbit around
Jupiter, the orbit not been exactly circular.
>
So much, so simple.
>
Some thought made me realise that although the tidal forces on Europa
mean that it is not exactly spherical, its two bulges cannot remain
perfectly aligned with Jupiter, because Europa's angular velocity
relative to Jupiter is higher at periapsis than at apoapsis. The result
is that the nearer bulge is sometimes ahead, and sometimes behind,
relative to Europa's orbital motion, resulting in a net force backwards
along the orbit, or forward along the orbit.
>
Again, certainly stuff that's already well known.
>
As far as I can see, the energy that is being dissipated as heat inside
Europa has to come from changes to Europa's orbit. Further, if Europa
were either perfectly rigid, or perfectly elastic, there would be no
energy transfer, and consequently no change to the orbit.
>
It would make no difference if Jupiter itself were perfectly rigid, so
the transfer cannot involve tides on Jupiter generated by Europa.
>
So the existence of the orbital energy transfer depends on Europa being
neither perfectly rigid nor perfectly elastic.
>
What escapes me is the mechanism.
>
Any thoughts?
>
I am thinking that the standard model for Earth is that supposedly
in the 1800s Lord Kelvin did some calculations.
>
At that time they had thought the universe was only full of stars.
>
Utter nonsense yet again, crackpot.
>
By 1600 astronmers were well aware of different types of celestial
bodies and beginning to measure distances to such.
>
Did they have a clue about galaxies.
>
"They" had a clue as early as 450 BCE crackpot.
 
No, fool.
They thought the stars were the lights from Heaven.

No, not everyone thought that crackpot.

>
The first attempts at measuring distant objects where made around 1000
CE crackpot.
>
The invention of the telescope in 1610 rather clinched the deal
crackpot.
 
Penisnino, all they found then that crystal spheres MAY NOT exist and
the Earth MIGHT go around the Sun.

Utterly wrong crackpot.

<snip remaing insane babble unread>



Date Sujet#  Auteur
30 Oct 24 * Europa and energy transfer27Sylvia Else
30 Oct 24 +* Re: Europa and energy transfer3Bertietaylor
30 Oct 24 i`* Re: Europa and energy transfer2Athel Cornish-Bowden
30 Oct 24 i `- Re: Europa and energy transfer1bertietaylor
31 Oct 24 +* Re: Europa and energy transfer19x
31 Oct 24 i`* Re: Europa and energy transfer18bertietaylor
31 Oct 24 i +* Re: Europa and energy transfer16Jim Pennino
31 Oct 24 i i`* Re: Europa and energy transfer15Bertietaylor
31 Oct 24 i i `* Re: Europa and energy transfer14Jim Pennino
1 Nov 24 i i  `* Re: Europa and energy transfer13bertietaylor
1 Nov 24 i i   +* Re: Europa and energy transfer10Jim Pennino
1 Nov 24 i i   i`* Re: Europa and energy transfer9Bertietaylor
1 Nov 24 i i   i +* Re: Europa and energy transfer3Jim Pennino
1 Nov 24 i i   i i`* Re: Europa and energy transfer2bertietaylor
1 Nov 24 i i   i i `- Re: Europa and energy transfer1Jim Pennino
1 Nov 24 i i   i `* Re: Europa and energy transfer5bertietaylor
1 Nov 24 i i   i  `* Re: Europa and energy transfer4Jim Pennino
2 Nov 24 i i   i   `* Re: Europa and energy transfer3bertietaylor
2 Nov 24 i i   i    `* Re: Europa and energy transfer2Jim Pennino
2 Nov 24 i i   i     `- Re: Europa and energy transfer1bertietaylor
1 Nov 24 i i   `* Re: Europa and energy transfer2Physfitfreak
1 Nov 24 i i    `- Re: Europa and energy transfer1bertietaylor
31 Oct 24 i `- Re: Europa and energy transfer1bertietaylor
31 Oct 24 +- Re: Europa and energy transfer1Physfitfreak
2 Nov 24 `* Re: Europa and energy transfer3Sylvia Else
2 Nov 24  `* Re: Europa and energy transfer2Physfitfreak
2 Nov 24   `- Re: Europa and energy transfer1bertietaylor

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