What is Gravity?

If NASA faked the moon landings, does the agency have any credibility at all? Was the Space Shuttle program also a hoax? Is the International Space Station another one? Do not dismiss these hypotheses offhand. Check out our wider NASA research and make up your own mind about it all.

Re: What is Gravity?

Postby ProperGander on September 7th, 2015, 5:06 pm

"3. Helium is so light that Earth’s gravity is not strong enough to hold on to it. When helium atoms are released into the atmosphere, they rise until they escape into space."

http://www.chemicool.com/elements/helium-facts.html

"Molecules in a gas are in constant motion zipping around and bouncing off each other. Lightweight gases such as hydrogen and helium move faster than medium-weight gases like nitrogen and oxygen. The heavy gases like carbon dioxide move at a slower rate of speed than the other two. To visualize this choose this link to an animation of molecular motion. A large planet like Jupiter with a strong gravitational pull is able to hold the light gases even though they move at high speeds. A small planet like Earth or Mars cannot hold onto lightweight gases. The moon is so small that its gravity is not even strong enough to hold onto the heavy gases like carbon dioxide, that means it has no atmosphere."

http://quest.nasa.gov/aero/planetary/at ... avity.html

This would mean a helium filled balloon in a room with a motionless atmosphere, should exhibit a 'Coriolis effect'. The balloon is defying gravity thanks to the helium.
The world would turn beneath the balloon if the Earth is spinning, The balloon should look like it is following a straight line to us, since we are rotating away from it. There'd also be the issue of the effect of momentum on the ballon as the centripetal force of gravity is cancelled.

A balloon that is left to rise up into the atmosphere would then also exhibit the same effect.
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Re: What is Gravity?

Postby Selene on September 7th, 2015, 6:39 pm

Nink wrote:Before I answer the question in regards to the makeup of the ~3*10^15 kg per year, and how something of such mass could enter our atmosphere relatively undetected, I would like to ask a couple of questions please.

1) Where did the ~1,386,000,000 cu km that scientists currently estimate or 1.386*10^21 kg of water on earth originate from?


What do you mean with "originate from" and when? Afaik the current models are debating endogenic (produced by the Earth itself) or exogenic (water meteorites) origins or the combination of those two.

I see many more arguments for the endogenic origin maybe aided by some wet meteorites:
- H2O is a simple molecule
- electrolysis and the opposite binding of H2 and O2 does not seem a complex process
- the Earth itself is very rich in different elements and H and O are very abundant
- for decent volumes of water to produce an endogenic origin makes sense
- we see it happening on Earth; hydrous minerals are exhumed in volcanic eruptions
- the cycle of water and oxygen is pretty well understood for the recent past (dO18/O16)
2) If the earth has remained the same size but the oceans according
to previously posted data, managed to rise and fall ~250 m over the past 200 million years, and if we assume this information is correct, where did that volume of water come from, and where did it go?


Sea level consists of 2 types:
- relative sea level - the sea level w.r.t. a local datum
- global, eustatic, sea level - the volume of water in liquid form in seas and oceans

You are and must be referring to the latter. For the recent ice age periods the sea level is mainly controlled by how much of it is stored in solids (ice) in glaciers and polar ice caps. Today that is volume X (and don't fall for the Antropogenic Global Warming Hoax that claims we will go to an ice-free world...).

In a complete greenhouse that X is increased by the volume of water now stored in ice (minus lakes and rivers that will be formed) and in a complete icehouse that X is decreased by the extra ice formed). The greenhouse/icehouse periods are in turn controlled by astronomical (Milankovitch) parameters; the position of the Earth w.r.t. the Sun. Which is also an interesting gravitational question in itself.

This glacial vs. interglacial variation alone can change the global sea level by some hundred meters and can be calculated (X0 +/- the ice volume).

For longer geological periods the global sea level is thought to be controlled mostly by the average rate of sea floor spreading (how fast new crust is created) and related subduction (how fast that crust is "consumed" again by the asthenosphere at subduction zones (e.g. the Pacific Ring of Fire). That is explained in more detail in the link I provided with the Eustatic Sea Level Curves on the previous page.

On your question; the vast majority of all water on Earth is not moving on top of the crust (seas, rivers and lakes; liquids, glaciers; solids and clouds; vapours), but is "stored" in hydrous minerals in the crust (clays and micas, zeolites and others) and mantle (same minus clay minerals).

This water is released more or is released less with varying spreading rates which results in changing H2O amounts on the surface.

At least this is the current model and so far I have not seen convincing arguments to doubt that, but I am open and all ears to get convinced of other views.

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Re: What is Gravity?

Postby hoi.polloi on September 8th, 2015, 12:41 am

I have just read through this discussion, which is relevant to the thread, but please do work your way back to the actual topic of gravity, when and if you proceed. Thanks.
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Re: What is Gravity?

Postby ProperGander on October 10th, 2015, 3:41 pm

A brief and partial history of the concept of gravity and who promoted the resulting 'science':

"Newton made clear his heliocentric view of the Solar System—developed in a somewhat modern way, because already in the mid-1680s he recognised the "deviation of the Sun" from the centre of gravity of the Solar System. For Newton, it was not precisely the centre of the Sun or any other body that could be considered at rest, but rather "the common centre of gravity of the Earth, the Sun and all the Planets is to be esteem'd the Centre of the World", and this centre of gravity "either is at rest or moves uniformly forward in a right line" (Newton adopted the "at rest" alternative in view of common consent that the centre, wherever it was, was at rest).

Newton's postulate of an invisible force able to act over vast distances led to him being criticised for introducing "occult agencies" into science. Later, in the second edition of the Principia (1713), Newton firmly rejected such criticisms in a concluding General Scholium, writing that it was enough that the phenomena implied a gravitational attraction, as they did; but they did not so far indicate its cause, and it was both unnecessary and improper to frame hypotheses of things that were not implied by the phenomena. (Here Newton used what became his famous expression "hypotheses non dingo"

"In April 1705, Queen Anne knighted Newton during a royal visit to Trinity College, Cambridge. The knighthood is likely to have been motivated by political considerations connected with the Parliamentary election in May 1705, rather than any recognition of Newton's scientific work or services as Master of the Mint.[86] Newton was the second scientist to be knighted, after Sir Francis Bacon."

"The President, Council, and Fellows of the Royal Society of London for Improving Natural Knowledge, commonly known as the Royal Society, is a learned society for science and is possibly the oldest such society still in existence.[a] Founded in November 1660, it was granted a royal charter by King Charles II as "The Royal Society". The society today acts as a scientific advisor to the British government, receiving a parliamentary grant-in-aid. The society acts as the UK's Academy of Sciences and funds research fellowships and scientific start-up companies."



Here is a theory that provides a mechanism for 'gravity':

The Le Sage theory:
"The theory now called “Le Sage’s theory of gravity” was originally proposed in the 1690s by Nicolas Fatio de Duillier, a friend of Isaac Newton and Christiaan Huygens. Fatio was a well-known Swiss personage, and the kinetic theory of gravitation was his most notable scientific contribution, to which he devoted much of his life. Le Sage said that he heard of Fatio for the first time through his father, because his father had heard the prophecies of the cevénots (camisards), and told him that Fatio was among those prophets. Le Sage’s father was well acquainted with the scientific fields in which Fatio worked, and he tutored Le Sage in the sciences. Nevertheless, Le Sage later claimed that his father never told him that Fatio had created a theory of gravitation essentially identical to his own. (Le Sage also admitted that he had a pathologically bad memory, so it is unclear if his recollection is accurate.) In any case, Le Sage stated that he knew nothing of Fatio’s theory until he was informed by his teacher Gabriel Cramer in 1749."

"The theory posits that the force of gravity is the result of tiny particles (corpuscles) moving at high speed in all directions, throughout the universe. The intensity of the flux of particles is assumed to be the same in all directions, so an isolated object A is struck equally from all sides, resulting in only an inward-directed pressure but no net directional force (P1). This could be used as an explanation for a gas based theory of 'gravity'.

Two bodies "attract" each other
With a second object B present, however, a fraction of the particles that would otherwise have struck A from the direction of B is intercepted, so B works as a shield, i.e. from the direction of B, A will be struck by fewer particles than from the opposite direction. Likewise B will be struck by fewer particles from the direction of A than from the opposite direction. One can say that A and B are "shadowing" each other, and the two bodies are pushed toward each other by the resulting imbalance of forces. Thus the apparent attraction between bodies is, according to this theory, actually a diminished push from the direction of other bodies, so the theory is sometimes called push gravity or shadow gravity, although it is more widely referred to as Lesage gravity."

source:
https://en.wikipedia.org/wiki/Royal_Society
https://en.wikipedia.org/wiki/Isaac_Newton
https://en.wikipedia.org/wiki/Georges-Louis_Le_Sage
https://en.wikipedia.org/wiki/Le_Sage%2 ... ravitation
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Re: What is Gravity?

Postby ICfreely on January 28th, 2016, 12:39 am

The Cubed Earth Model

To G or not to G, is the question
And like Smith told Wesson
I'm shady with the .380 old school diploma
I'll leave that ass in a coma

--O'Shea (IceCube) Jackson, Really Doe



The following textbook attempts to prove the spherical shape of the Earth by comparing it to a Cubical Earth!


Ch. 7 - The Earth-Moon-Sun System – The Earth’s Size and Shape

pg. 186 (3 of 32)

Ancient Measurements Earth’s shape is similar to a sphere. A sphere is a round, three-dimensional object, the surface of which is the same distance from the center in all directions. Even ancient astronomers knew that Earth is spherical in shape [appeal to ‘ancient’ authority]. We have pictures of Earth from space that show us that it is spherical [appeal to NAS-holery], but how could astronomers from long ago have learned this? They used evidence from observations.

Aristotle was one of these early astronomers. He made three different observations that indicated that Earth’s shape is spherical. First, as shown in Figure 1, no matter where you are on Earth, objects fall straight down to the surface, as if they are falling toward the center of a sphere. Second, Earth’s shadow on the Moon during a lunar eclipse is always curved. If Earth weren’t spherical, this might not always be the case. For example, a flat disk casts a straight-edged shadow sometimes. Finally, people in different parts of the world see different stars above their horizons. More specifically, the pole star Polaris is lower in the sky at some locations on Earth than at others.

http://mrfrawley.wikispaces.com/file/view/Earth,+Moon,+Sun+System+Reading.pdf



You see? If the Earth weren’t spherical (it would be cubed), then objects wouldn’t fall straight down to its surface. Speaking of cubes:


IceCubeSouth Pole Neutrino Observatory
IceCube is a particle detector at the South Pole that records the interactions of a nearly massless subatomic particle called the neutrino. IceCube searches for neutrinos from the most violent astrophysical sources: events like exploding stars, gamma-ray bursts, and cataclysmic phenomena involving black holes and neutron stars. The IceCube telescope is a powerful tool to search for dark matter and could reveal the physical processes associated with the enigmatic origin of the highest energy particles in nature. In addition, exploring the background of neutrinos produced in the atmosphere, IceCube studies the neutrinos themselves; their energies far exceed those produced by accelerator beams. IceCube is the world’s largest neutrino detector, encompassing a cubic kilometer of ice.
http://icecube.wisc.edu/



If IceCube and Roald Amundsen’s miraculous 1911 expedition to the South Pole aren’t enough to convince you of
the Earth’s sphericity, then consider the following:


The good old days. In 1666, when Isaac Newton [“]discovered[“] his law of gravity, people did not need to understand the calculus that Newton [had claimed he’d] invented so he could calculate the orbit of the moon. It was enough [, for the unwashed masses,] to know that there is a universal force that causes apples to fall to the ground and that this same force holds the moon in its orbit around the earth. There was nothing paradoxical [(if by paradoxical you mean sensible)] about this concept; indeed it explained [away] so many things that the poet Alexander Pope wrote as Newton’s epitaph:

Nature and Nature’s laws lay hid in night.
God said, “Let Newton be!” And all was light.


http://www.quantum-field-theory.net/chap-1/


And:


Gravity: from weightlessness to curvature

In part, gravity is an illusion. In part, it is associated with a quantity called "curvature". Overall, gravity is intimately connected with the geometry of space and time.

The elusiveness of gravity

Most readers will have seen footage showing situations like this, involving, for instance, astronauts aboard the international space station ISS. Those astronauts haven't escaped the earth's gravity - they're experiencing a very special kind of free fall, a free-falling orbit around the earth

The elusiveness of curvature

But in spite of the differences in geometry, the following still holds: If you look at a tiny region of the sphere's surface, you'll be hard-pressed to find a difference between it and the corresponding region on a plane. In fact, that's what we do every day: We draw city maps, which show a comparatively small part of the earth's surface, just as if the city had the same geometry as that flat sheet of paper we're drawing on:

This works quite well, although, in reality, the city region is part not of a gigantic plane, but of the surface of a gigantic sphere, the earth. Only when you look at larger regions will you notice that the surface is, in fact, curved; the larger the region, the more distinct the signs of curvature.

http://www.einstein-online.info/spotlights/geometry_force#section-3



I'm sorry Ms. Jackson (oh) I am for real!
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Re: What is Gravity?

Postby Farcevalue on January 28th, 2016, 7:28 pm

So, the apple falls from the tree, due to the same force that keeps the moon in place relative to the earth, but the astronots in between the apple and the moon have escaped that force.

Got it.

Of course Cavendish had to have balls to get a constant out of this.
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Re: What is Gravity?

Postby Painterman on February 13th, 2016, 7:21 am

This question is worth another look after the recent chirp (or thud) we're told proved Einstein at a $1.1 billion observatory.

hoi.polloi wrote:What is gravity?

Gravity is a force of attraction between all material objects that is proportional to the product of their masses and inversely proportional to the square of the distance between them. (Admittedly, this doesn't really explain what gravity "is" - but that remains an unknown, in my opinion.)

The foregoing is what's called an "operational definition". This type of definition defines a concept by what is actually measured (force, in this case). Such definitions are useful when dealing with bad-faith purveyors of junk science, because these phonies typically base their pitch on "special effects" rhetoric and can't handle arguments framed in terms of empirical observation.

Whenever this force has been sought between known masses in the lab, it has been found as expected. I've never seen a counterexample cited by any "gravity denier" (apologies to George Orwell).

Whether, and in what way, this force exists in "outer space" is another question, because independent confirmation in this area is nearly impossible.

Flat Earth Theorists believe it is simply caused by mutual acceleration of the entire Earth, which is physically flat, and constantly going faster and faster "up".

A moment's thought will show that a literal upward acceleration of the surface can't possibly be the source of gravity, even on a flat Earth, because the so-called "acceleration" of gravity varies by a significant amount across the surface of the Earth - e.g. an object weighs 0.5 percent more at the poles than at the equator.

If the North Pole were accelerating upward 0.5 percent faster than the equator, the disastrous consequences would be obvious. So the "upward acceleration" theory of gravity proposed by flatology is a nonstarter.
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Re: What is Gravity?

Postby JLapage on February 13th, 2016, 6:18 pm

Painterman wrote:This question is worth another look after the recent chirp (or thud) we're told proved Einstein at a $1.1 billion observatory.

hoi.polloi wrote:What is gravity?
Gravity is a force of attraction between all material objects that is proportional to the product of their masses and inversely proportional to the square of the distance between them. (Admittedly, this doesn't really explain what gravity "is" - but that remains an unknown, in my opinion.)

The foregoing is what's called an "operational definition". This type of definition defines a concept by what is actually measured (force, in this case). Such definitions are useful when dealing with bad-faith purveyors of junk science, because these phonies typically base their pitch on "special effects" rhetoric and can't handle arguments framed in terms of empirical observation.

Whenever this force has been sought between known masses in the lab, it has been found as expected. I've never seen a counterexample cited by any "gravity denier" (apologies to George Orwell).

Whether, and in what way, this force exists in "outer space" is another question, because independent confirmation in this area is nearly impossible.

Can you back up your statement that I highlighted in pink? By the way I am not a gravity "denier". What experiments in the lab have you read about or better yet done yourself?
Last edited by JLapage on February 13th, 2016, 6:29 pm, edited 1 time in total.
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Re: What is Gravity?

Postby ICfreely on February 13th, 2016, 6:28 pm

And if if was a fifth we'd all be drunk. If you'd been around in the early day of this website you'd have 'cautioned' everyone to avoid questioning NASA in order to 'preserve the integrity' of this forum's 9/11 research. Keep brown nosing you coward. You'll eventually expose yourself for the PARASITIC INFILTRATOR that you are. As for me, I'm content with the ORIGINAL CONTENT I've contributed over the last year. Genuine readers will eventually catch up with and supersede my research. Disingenuous momos like you will keep running around in circles. Keep on 'exposing flatoloy subversion' like the good little house boy that you are. Like smj I'm done. You don't deserve the benefits of our research.


P.S.

And Fuck You very much for poisoning the Einstein thread with your bullshit. Run like the wind & don't drop the baton bitch! :)
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Re: What is Gravity?

Postby simonshack on February 13th, 2016, 8:13 pm

Relax, dear ICfreely (and JLapage) - don't walk out on us, come on ... As always, I'm keeping a watchful eye on things - don't worry! -_-
And as always, I'm a bit slow (sometimes strategically so) before taking appropriate actions. Chill out, guys.
And yes, Painterman - I also have pretty much the same questions as ICfreely and JLapage - so I'll be awaiting your reply to them.
And if smj reads this, please come back. I, for one, am missing your superb diggings and info.

I hope all good folks appreciate how hard it is to moderate this forum - please bear with my (and my fellow admins) occasional shortcomings / inefficiencies / latencies, as we're only human. Thanks.

As an example of what we REALLY need to combat (regarding the gravest gravity of science-quackery) - here's something I watched today (keep your barfbags ready). I can't think of anyone quite as full of shit as this slimy Brian Cox BBC clown :


full link: http://www.youtube.com/watch?v=E43-CfukEgs
(Just realize what we're up against: the above psyence trash has almost 13 million views - ffs... )

As you can see, there are FAR graver / large-scale psyence acts out there which need to be dealt with - rather than worrying about upholding some sort of (rather unrealistic) linear, absolute perfection / cohesion of the material posted on this forum by different people from around the world. I'm not saying "why can't we just be all friends" - but only asking for a little tolerance towards the difficulties in running this place as smoothly as possible.
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Re: What is Gravity?

Postby Critical Mass on February 14th, 2016, 5:36 am

I suppose I'm not the only one who thinks someone could set off a small rocket in that ("nuclear bomb" proof) vacuum chamber & help answer a serious question that Cluesforum & others have raised?

Instead of needlessly "proving" that air resistance exists which is, as far as I'm aware of, a fact "not in dispute".


As for the Einstein-ien bullshit at the end of the Cox video... one can only shake their heads in amazement at the nonsensical thought processes involved.




-"Something is falling & hitting the ground with a visible & forcible impact"

-"However without the ground or a background there would be no apparent fall or impact"

-"Therefore there is no fall or force"



At least Ancient peoples beliefs in "benevolent ancestors" or "angry sky spirits" made some sense (the effects of a thunderstorm are something that one could clearly mistake for anger).. but this?
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Re: What is Gravity?

Postby pov603 on February 14th, 2016, 6:30 am

I thought the biggest vacuum chamber in the world was between Brian Cox's ears?...



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Re: What is Gravity?

Postby Kham on February 14th, 2016, 6:32 am

I suppose I'm not the only one who thinks someone could set off a small rocket in that ("nuclear bomb" proof) vacuum chamber & help answer a serious question that Cluesforum & others have raised?
- CM

We could even start low tech, how about setting off a balloon car in the vacuum chamber first? If that works, and I know it won't, THEN we could move towards the more expensive rocket.

Image
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Re: What is Gravity?

Postby simonshack on February 14th, 2016, 11:30 am

pov603 wrote:I thought the biggest vacuum chamber in the world was between Brian Cox's ears?...


Unfortunately, it seems that sound waves can actually propagate out of that particular vacuum chamber ... :P


full link: http://www.youtube.com/watch?v=6EJ8r9Rhfw8


(Hat tip to my pen friend Vinny - who sent me the link to this priceless, breakfast-table 'Coxplanation' of gravitational waves)
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Re: What is Gravity?

Postby Painterman on February 14th, 2016, 11:35 am

JLapage,

Regarding your concerns which you highlighted in pink, I was at fault for being unclear and therefore apologize. In the sentence that immediately followed the sentence in question, I wrote:

I've never seen a counterexample cited by any "gravity denier" (apologies to George Orwell).

This was meant to clarify the preceding sentence, the pink sentence, though apparently this intent was improperly conveyed by me. So, what I meant by saying that gravity has always been found as expected between known masses in the laboratory (by itself an untenably sweeping statement, of course) is: there are no experiments known to me in which the predicted force of gravity was looked for and not found.

If you know of such an experiment, one which found a different-than-expected force of gravity under these conditions, please cite it here, as this would be a huge deal in physics of which I should be informed. Thanks.

Farcevalue,

I'm glad you posted what you did, because I've been meaning to address both of these points since flatology went into full promotion mode a year ago.

Farcevalue wrote:So, the apple falls from the tree, due to the same force that keeps the moon in place relative to the earth, but the astronots in between the apple and the moon have escaped that force.

Actually not, astronauts would also experience the force of gravity. The theory is that gravity manifests itself to astronauts as the centripetal force of their circular orbit. If there was no gravity pulling the astronauts down, they would simply fly off into space in a straight line. That a ship in space - or any object anywhere - moves in a circular path requires a force, in this case it's gravity.

centripetal force
noun
1. the force, acting upon a body moving along a curved path, that is directed toward the center of curvature of the path and constrains the body to the path.

(dictionary.reference.com)

That's the theory, in any case. I, for one, never questioned it. However, the abundant fakery of space imagery, including the complete absence of plausible high-orbit photographs of Earth, means something about "outer space" (possibly including gravity) is very different than what we're being told. I'm searching for the answer as to what that something is.

Of course Cavendish had to have balls to get a constant out of this.

The value of the gravitational constant, which Cavendish is credited with first establishing, is a consequence of the measurement units you choose, and in that sense is arbitrary: a mere mathematical artifact. What really counts about gravity as a physical phenomenon is what I tried to explain in my previous post in this thread. Namely, there is an attractive force between material objects, and the magnitude of this force depends on their masses and the distance between them.

In theory, this force is always present between all material objects. Obviously, "always" and "all" are impossible to prove in physics, so instead we wait and see if someone produces a counterexample in which the predicted gravitation is falsified. To my knowledge, we're still waiting after three centuries.
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