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Gian

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Posts posted by Gian

  1. 22 hours ago, Lorentz Jr said:

    TO EVERYONE

     

    If you have time, can people give me their response to this video on artificial gravity please?

    The coriolis effect is discussed from 13.31

    I've no science beyond GCSE so I can't evaluate all the technicalities.

    GIAN xxx

     

  2. As a means of creating artificial gravity sci-fi authors and movies have often suggested using a centrifugal force in a rotating space station or spacecraft, as in 2001 A Space Odyssey

    However the idea apparrently fails to take note of the "Coriolis effect" which would cause immediate nausea and loss of balance, like motion sickness, unless the rotating radius were very large eg 1 mile+

    Yet even Lord Nelson was seasick for several days after putting to sea, but would then gain his sea legs and be unaffected.

    Is it possible that the bodies of individuals like the crew of 2001's spacecraft Discovery One may adapt after a few days and get their "space legs" leaving them unaffected by the Coriolis effect?

    Thanks

    GIAN🙂

  3. On 11/11/2022 at 6:47 PM, Bufofrog said:

    The earth didn't exist 5 billion years ago, so I am not sure what common origin you are talking about.

    The common ancestor is the Big Bang, the creation of the universe.

    The creation of the matter (or energy or whatever) was initiated which eventually made up the Milky Way, the Earth, then us, and also the astrological stars and planets in which astrologers examine for patterns. 

  4. 1 hour ago, dimreepr said:

    Perhaps he meant the observable universe, you know these student's, some of them miss a word or two.

    And???

    The only problem is, as with all complex signal's they degrade with distance and so become indiscernible from the background noise, at some point; if so it is entirely supernatural to somehow see the object...

    Why can't anyone here get me??

    I don't mean that distant matter is influencing events on Earth. I mean that distant matter has an origin  in common with events here. Therefore it may be possible there's an observable correlation between the two, even though they are now of no influence on each other at all

  5. On 8/13/2022 at 5:52 AM, MigL said:

    You have to stop taking literature so seriously.
    Thank God you read the Hitch-hiker's Guide and not the Bible.

    We were told in GCSE Physics that every particle of matter in the universe exerts a gravitational pull on all other particles of matter

    On 8/12/2022 at 6:38 PM, TheVat said:

    (started writing this before exchemist posted)

    Due to the inverse square law, the gravitational effects of distant stars are negligible.  

    When you were born, a neighbor in a house near the hospital was running their vacuum cleaner.  This created some EMF emissions that might interfere with old tv signals back when they were on VHF frequencies, and would very slightly impact baby you's atoms.  Would that make you a Vacuum Cleaner Baby, destined to go through life being tidy?   Or perhaps there was a garbage truck backing up outside the wall of your birthing room.  Would the miniscule gravitic force of that truck make you a Garbage Baby, destined to pick up debris?  That's about how much sense astrology makes.

    That's not what I mean lol

    I don't mean that the stars are affecting us at this point in time, of course they're not, or not in any discernible significant way.
    What I mean is that all objects - matter and energy - have a single common ancestor; Creation, the Big Bang. 

    In dendrochronology we can see the weather year by year affecting tree rings. It wouldn't surprise me at all if the behaviour of some objects is discernible as "mirages" in the behaviour of other objects within our universe, as they all had the same single starting point. If so this is not remotely supernatural, and is so inexact it probably isn't very useful.

  6. 17 minutes ago, TheVat said:

     

     

    Gravity affects atoms the same way it affects all other matter. Every atom creates its own gravitational field which attracts all other matter in the universe. Steve Gagnon, Science Education Specialist 

    Im still reading and pondering your reply but here's Point 1:
    So is it true that the particles that make up this planet, you and me attract the particles which make up objects on the other side of our universe?

    2 hours ago, MigL said:

    Huuh ?  This is aa science forum.

    "Richard Dawkins is especially scathing of astrology, along with ALL scientists."

    Scientist and astrologer are mutually exclusive; you cannot be both.


    And 'all atoms in the universe' cannot affect each other, unless they are in causal contact.
    An atom in the Sun cannot affect you until more than 8 minutes have elapsed.
    Atoms in our nearest stellar neighbour cannot affect you for a period of more than 4 years.
    Atoms in the star Mizar will never affect you as it takes light/information 80 years to reach us, and you will be deceased by then.

    As for the universe being deterministic like clockwork, and everything 'going to happen' since the Big Bang, that is also false because at small scales, the universe is probabilistic. You see, quantum Mechanics is science; astrology is not.

    Gravity affects atoms the same way it affects all other matter. Every atom creates its own gravitational field which attracts all other matter in the universe. Steve Gagnon, Science Education Specialist 

  7. Richard Dawkins is especially scathing of astrology, along with most scientists.

    But I wonder what scientists here think of this idea from the Hitch-Hikers Guide To The Galaxy about the Total Perspective Vortex;

    "The idea is that, if every atom of the universe is affected by every other atom of the universe, it is in theory possible to extrapolate the whole of creation—every Galaxy, every sun, every planet, their orbits, their composition, and their economic and social history from, say, one small piece of fairy cake."

     So if every atom of matter attracts every other particle of matter in the universe, it follows that there's a relationship between the attributes and behaviour of celestial bodies (the fairy cake) and the matter here on Earth.

    And as the planets' existence and our lives have been "going to happen" since the Big Bang, viz all events in the universe have a single common ancestor, is it possible that astrologers have identified readable patterns of behaviour in the heavens which relate via the Big Bang with events on Earth?

    Eg put very simply, after a lecture hall has emptied, a scientist could I assume measure temperature and other attributes and estimate the number of students who had been present. Thus there's a relationship between the temperature of the lecture theatre, and the behaviour of students. Can astrology be the observation of similar patterns?

    Thanks

    GIAN x

     

     

  8. 1 minute ago, beecee said:

    Listen matey, I'm only a poor old retired maintenance Fitter/Machinist/Welder, who has always had a great interest in cosmology and astronomy, but was having to much fun as a hairy arsed kid to do too  much about it.

    If you want to gain knowledge in that arena, but havn't the qualifications, start by reading some reputable books....I started many years ago with Stephen Hawking's Brief History of Time....somewhat dated now though, but there are many others...The First Three Minutes by Stephen Weinburg...anything by Carl Sagan of course...Lawrence Krauss and Neil DeGrasse-Tyson are other notable authors of late.

    There's absolutely nothing wrong with manual skills, it's what this country was built on including science. Ive done site labouring and you can't get bricklayers and plasterers. Alot of my schoolmates could sit in front of a screen pressing buttons all day, but were scared shitless of honest grime.

  9. 3 minutes ago, beecee said:

    No probs!

     

    Cosmology/Astronomy as Carl Sagan said at the end of his "pale blue dot" narrative,   "astronomy is a humbling and character-building experience".

     

    I would add awesome and mind-blowing to that description.

     BTW I don't think Im naturally talented at maths, (highest; grade C at GCSE.) Do you think I'd need to be 1st class BA (hons.) material at mathematics to have a hope of being a professional astrophysicist working eg for nasa? 

    Cheerz GIAN 🙂

     

  10. On 7/6/2021 at 12:01 PM, beecee said:

    The singularity at the core of a BH is where our laws and GR break down, no question about that. But most physicists reject the singularity as defined by infinite spacetime curvature and density.

    What we can reasonably expect is that which GR tells us...that is once the Schwarzchild radius is reach, further collapse is compulsory. Which means that most of the BH [ignoring in falling matter/energy] we can say is just critically curved spacetime, at least up to the quantum/Planck level where our singularity resides, and where our knowledge stops. Rejecting the singularity of infinite spacetime curvature and density, would mean a surface of sorts, in an unknown state, at or below that quantum/Planck level.

    Thanks Mr Beece, that's interesting. I'll have to go and look up quantum/ planck theory, and also Planck volume. but well done for getting me motivated.

    BTW I'm not naturally talented at maths, (highest; grade C at GCSE.) Do you think I'd need to be 1st class BA (hons.) material at mathematics to have a hope of being a professional astrophysicist working eg for nasa? 

     

    Cheerz GIAN 🙂

     

  11. At what point in the future before the heat death of the universe (which I believe will be in 10¹⁰⁰ years' time) will it become impossible for any sort of biological life anywhere in the universe to continue?

    Will it be when all the stars have burnt out or what?

    Cheerz GIAN 🙂

  12. On 7/6/2021 at 12:03 PM, swansont said:

     

    Yes. We don't have knowledge of the laws of physics at that scale. We don't know the answer.

    Why does it have to happen instantaneously? That's not the only option.

     

     

    Well because I was given the impression that the singularity does not and cannot have any dimensions; the singularity is 0x0x0mm. 

    Yes it's not instantaneous, but I thought that because of the gravity involved, it wouldn't take that long to reach 0x0x0mm. 

    But given these forces, I guess it never quite gets there. 

    I read somewhere that eventually black holes will evaporate away, although I've no idea how

  13. I found loads of Red Squirrels on the Isle of Wight in the summer, but due to the invasion of Grey Squirrels very few are left on the mainland of Great Britain.

    Is it theoretocally possible to develop a pharmaceutical contraceptive substance specific to one particular species like the Grey Squirrel, but which would not affect Reds or any other species? 

    We need our Reds back!

    Cheerz GIAN😊

  14. 7 hours ago, beecee said:

    Space mining is still a dream at this stage, but the Asteroid belt and Kuiper belt would be promising places to look, when we have the technology.

    There was a company called "Planetary Resources" but I believe that was bought out and/or made defunct in 2018.

    https://en.wikipedia.org/wiki/Planetary_Resources

    Thanks 🙂

    1 hour ago, SergUpstart said:

    $10,000 quadrillion asteroid Psyche?

    By the way, you can’t (at present) put a true price on objects such as asteroids. But many have tried to estimate the worth of asteroid Psyche, with its metal-rich composition. One estimate suggests the massive, metal-rich object is worth $10,000 quadrillion (that’s 15 more zeroes), more than the entire economy of Earth. https://earthsky.org/space/asteroid-psyche-metal-or-rubble-pile/

    Does her composition give psyche a magnetic field?

    7 hours ago, beecee said:

    Space mining is still a dream at this stage, but the Asteroid belt and Kuiper belt would be promising places to look, when we have the technology.

    There was a company called "Planetary Resources" but I believe that was bought out and/or made defunct in 2018.

    https://en.wikipedia.org/wiki/Planetary_Resources

    Thanks 🙂

  15. Do we know many metals are in the outer solar system? eg the gas giants, Pluto, their moons and the Kuiper belt? 

    Or can someone point to some easily intelligible layman's literature.

    I'm thinking that if human beings were living there, they'd need to mine metals to make their own stuff.

    Cheerz

    GIAN 🙂

  16. Theoretical physicists always proclaim portentously that the singularity at the centre of a black hole "is where our laws of nature break down" which sounds to me like another way of saying "we don't know the answer."

    But as no physical process is ever absolutely instantaneous (I think,) surely the collapsing matter gets smaller and smaller while slowed down by ever increasing density so it never quite gets to the singularity and the process continues to infinity.

    Eg if you keep dividing 1 by 2 you'll never get to zero.

    Cheerz

    GIAN🙂

    (I've no science qualifications beyond gcse maths n physics grade C, so pls be gentle with me.)

  17. Thanks for the above replies.

    Hi Zapatos, with a pulled pork sarnie I could do without chips. But yes you have a really good point. Sci-fi often pictures settlers arriving on new worlds and then starting agriculture to support themselves. But in our solar system, maybe it would be a good idea to start producing food on other planets of the solar system before people get there.

    And if someone sent a crate of pork chops to Titan, with her surface temperature of -290°F, I bet they'd still be edible even if explorers didn't get there for another ten years.

  18. Scientists theorize that there may be a big subterranean ocean of liquid salt water on Europa, and there is a proposal to send a space probe which could drill down to it.

    In such an ocean there would be presumably no light, and I don't know if there'd be any COor what temperature the water would be, but by introducing autotrophs from our own oceans would it be possible for explorers to start a food chain, gradually introducing higher species culminating in fish?

    This would permanently give explorers and settlers something to eat, although they'd have to have chips sent up from Earth.

    Cheerz GIAN 🙂

  19. If microbial life is discovered in Venus' atmosphere, and samples are collected, will science be able to tell us whether its ancestry somehow found its way there from Earth, or whether it's definitely a product of abiogenesis on Venus?

    Thanks

    GIAN 🙂

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