Yousuf Khan wrote:

granite stone wrote:
I read an article that the moon's force on the mantle might give us
magma and magma is not chemical. In the same way some of the larger
planets may have a pull on our sun's mantle giving us solar
radiation. Since the sun spins every 6 days the spin travels through
the pull on the sun's mantle, energy, huge amounts of it, is given
off. If all stars are suns, you could say each star has planet
pulling on each sun's mantle.

Google Tidal Forces Io and lots come up from NASA.

You fail to notice, that the energy from tidal heating can be anything
from considerable (like Jupiter's effect on Io), over negligible (Moon's
effect on Earth) to ridiculous (*any* other body's effect on our Sun).

Uh, where do I start?

First the Moon and Earth's mantle. What you're talking about is tidal
heating. Typically tidal heating is more pronounced when a larger body
tugs on a smaller body, with a big size ratio between them. Your example
of the tidal forces on Saturn's moon, Io, is an example of that. Saturn
pulls on Io's crust and mantle and heats it up, but Io's tidal forces on
Saturn are puny by comparison. Similarly the Moon's tidal forces on
Earth are puny, and don't cause much heating in its mantle or anywhere
else. Earth's tidal forces on the Moon are much more substantial, but
still not substantial enough to create volcanism on the Moon. Most of
Earth's heating comes internally from its own nuclear fission core.
Earth's iron core is suffused with large quantities of uranium.

No - it's not fission. Uranium - as well as thorium and potassium
generate heat through radioactive decay, which is not the same as
fission. Fission is one kind of radioactive decay, but it's very rare in
nature, including Earth's core - unless you count alpha decay as
fission. Also, U, Th and K are not only present in the core, but
throughout the planet, though the heavier elements may be more
concentrated in the core.

The Sun doesn't have a mantle. A mantle is a layer within a solid planet
between the crust and the core of that planet. What one might call a
mantle for the Sun would be its convection layer. The Sun doesn't have a
crust or a mantle, but it does have a core. The core of the Sun is where
nuclear fusion takes place, just like the core of the Earth is where
nuclear fission takes place. The nuclear fuel at the core is the main
source of heat for stars and planets.

Yousuf Khan

As I said there fisson is negligible - the fraction is much less than
0.1% of the radioactive decay energy. And the decay takes place
throughout the planet.
There has been one known occurance of natural fission, not in the core,
but in ore deposits in Gabon, around 2 billion years ago. Google
"fission reactor Oklo" to read more about this.
Probably the radition disaster in Tjeljabinsk, Russia was also a result
of a spontaneous fission reaction, though hardly natural, as it took
place in a nuclear waste deposit.

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