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Can anyone give me some context about this rock/stone in my garden? How did the other stones become attached ? what's the plant ? What of the rock itself ?
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Everything spins, but the universe isn't a thing. An object without a bounded size cannot meaningfully spin.
Ewe spin me right round quickly,
tight round, getting dizzy,
ralph a one pound ground round moundSpin in relation to what?Spin is absolute, and need not be in relation to any particular frame, although something's angular momentum is at least relative to an axis, but angular moment and spin (RPM say) are different things.
Spin in relation to what? A spin is usually observed from some static frame of reference. Maybe it is spinning and this causes the observed expansion but there is no way to determine this without said frame of reference which by definition does not exist.
No obvious reason why not, but whilst an elementary textbook might show any organ merely devouring glucose and oxygen (science), the details of the plumbing and chemistry are very complicated (engineering - or biology, if you prefer).
Old Irish story: Traveller arrives in Dublin and asks the way to Cork. Bloke says "If I was going to Cork, I wouldn't start from Dublin". So here's the sales engineer's response:
The simplest and cheapest way of keeping a head alive is to leave it attached to the original body, which can process common foods and ambient air into whatever the brain needs. Our standard product runs on fish, chips and mushy peas, washed down with beer. Runs for about 80 years with minimum maintenance, and if you get a complementary pair, they will make another one - complete with head - automatically.
Could my head(or anybody else's head) remain alive and well if attached to the appropriate equipmentThe technology may not be currently up to the task, but since your body constitutes 'appropriate equipment', the answer is very much yes. All it has to do is what the rest of you does.
You could always attach the head to a different host like the other end of the neighbor sheep producing a sort of 'push me pull ewe'.
A magnetic field is generated by the movement of conductive fluids inside the Earth and the Sun.
- In the case of the Earth, this is liquid iron/nickel alloy in the outer core
- For the Sun, it is Hydrogen/Helium plasma in the core
- Laboratory studies have used liquid sodium, and produced magnetic field reversals on timescales that are feasible in a laboratory experiment (ie much less than years)
- As you could imagine, there is a very different viscosity and inertia (and temperature) between these different fluids
- So it is not surprising that magnetic field reversals happen on very different timescales in these different environments.
Fluid flow is often a chaotic process, as we see with the Earth's magnetic field, and laboratory studies.
- The Sun's magnetic field is not exactly a model of regularity, since sunspots virtually disappeared for 70 years during the Maunder minimum (ironically, this started not long after Galileo brought them to the attention of European scientists - the Chines had been studying them for centuries).
Apparently, the current record-holder for blackest materials (as of 2019) is a forest of carbon nanotubes grown on aluminium, claimed to absorb 99.995% of incoming light.
- Ultrablack materials are very useful in construction of telescopes, as they reduce those annoying lines radiating from bright stars, and other optical defects.
But black holes are far blacker: Despite the accretion disk of a black hole getting hot enough to emit X-Rays, the event horizon of a solar-mass black hole has an effective surface temperature of around 60 nanoKelvins, due to Hawking radiation.
Can Gravitational waves Cause Physical Harm ? say, they were mega strong ? What am I going to feel as they pass through me ? Will I puke sheepy sick ?It affects large things before small sheepish size things. At a moderate distance, Earth would definitely feel it, being stretched this way and that, causing earthquakes and volcanoes and such. But if one was close enough to a source of such gravitational wave energy, the tidal forces of the masses involved would already be tearing Earth apart in a similar way via tidal forces, even in the complete absence of the thing putting out gravitational waves.
So point is, try to keep the sheepy pasture reasonably far away from really massive objects.