Gravity

Neutron stars are prevented from collapsing under their own gravity primarily by neutron degeneracy pressure, which arises from the principles of quantum mechanics. In a neutron star, the neutrons are packed closely together, and the Pauli exclusion principle forbids them from occupying the same quantum state. This pressure counteracts gravitational collapse, allowing the star to maintain its stability. If the mass exceeds the Tolman-Oppenheimer-Volkoff limit (about 2 to 3 solar masses), even this degeneracy pressure may not be sufficient to prevent collapse into a black hole.

Yes. Without gravity, we would have NO air to breathe.

An imaginary device, which like perpetual motion, does not exist.

No.

To even reduce it by 75% you must travel out to 4000 miles.

If it didn't everything in the universe would have gone flying apart long ago and there would be no universe!

The gravitational forces between any two masses are equal on each mass.
Your weight on Earth is equal to the Earth's weight on you.

Aristotle believed that gravity was a result of the natural tendency of objects to seek their "natural place" in the universe. He posited that heavier objects, like stones, would fall to the ground because they are striving to return to the Earth, which he considered their natural element. In contrast, lighter objects, like smoke or fire, would rise toward the heavens. This view differed significantly from the later understanding of gravity as a universal force, as proposed by Newton.

-- All the other members of the solar system ... planets, asteroids, comets, meteoroid swarms,
Kuiper Belt and Oort Cloud objects ... would simply keep going in straight lines from wherever
they were when the gravity got turned off. The solar system would simply unravel, and cease
to be a collection of objects that are related in any way.

-- The sun itself would also fly apart, becoming a cloud of hydrogen and helium that got thinner
as it got bigger.

Well gravity's job is to attract objects to one another. Its like the cupid of objects. So basically inside a galaxy gravity will attract each and everything together. So everything starts to coalesce into a huge ball of light that contains billions of stars and dust with a black hole at the core of the huge lump.

Gravity pulls gases to center of the disk is 5. The Big Bang is 1.

The answer depends on whether they are the foci of an ellipse or a hyperbola.

The energy produced by the star, which manifests itself as heat.

The gravity of a planet is directly proportional to its mass, and inversely proportional to the square of the distance from the center of mass. For the gravity on the surface of the planet, the distance is just the planet's radius.

Thus, if a planet has three times the mass, it has three times the gravity. If you are three times as far away, the gravity decreases by a factor of nine.

Your "weight" is the magnitude of the gravitational force between you

and another mass.

-- In deep space, far from any other mass, the gravitational force between

you and any other mass would be very small, but never zero.

-- Near a back hole, the gravitational force between you and the black hole

would be

(gravitational constant) x (your mass) x (black hole's mass)/(your distance from the black hole)2

If you introduce air into a space where gravity is zero, then air exists there.

A current example is the inside of the International Space Station, where the

crew live and work in a "shirtsleeve environment" that includes air, pressure,

and warmth, but they also live and work in an environment of weightlessness,

or what is popularly but erroneously called "zero gravity".

Humans may get weak in a lack of gravity situation, due to the lack of use of certain muscles.

"Escape velocity" is the speed with which an object would have to leave Earth in

order for gravity to never pull it back. That means that even though Earth's gravity

keeps slowing it and slowing it and slowing it, it never slows to zero. At any

distance from Earth, the object is still moving away. It would only run out of gas

and stop when it got infinitely far away from Earth.

In order to calculate the escape velocity, we simply play that video backwards. We

place the object at 'infinity', let go of it, let Earth's gravity get ahold of it and pull

it all the way in, and we calculate how fast it's going when it hits the ground. It's not

a very difficult calculation, because gravity and distance are so easy to work with.

If we let the object have some kinetic energy before the Earth got ahold of it and

it started falling in, then we'd wind up with a number that's slightly wrong.

The asteroid belt does not have a surface as it is not an objects. It is a loose scattering of objects.

Because the mass is not dependent on the gravitational influence.

I think you're saying that the pendulum itself is an iron bar.

-- The period of the swing is determined by the pendulum's length. Whether the pendulum
is a long distributed mass, or just all one lump down at the end, its effective length in
either case is the distance from the pivot to its center of mass.

-- Rising temperature makes the iron bar longer, but doesn't change its mass. So its
center of mass becomes farther from the pivot, and its period of swing increases.

-- So higher temperature would make the clock run slower.

This sounds like an elegant way to detect small differences in local gravity at different
places. I don't know for a fact, but I'll just bet that this is how it's actually done, with
a portable instrument based on a pendulum-regulated timekeeping device.

I have never seen the show. But I couldn't resist dropping in to tell you of

my amazemant and admiration for anyone who can play chords on a flute.

Gravity makes the Moon remain in orbit around Earth.

Gravity is not a concept that can be quantified, so it isn't possible to say how much there is anywhere.

But every body in space attracts every other body. The good thing is that all these attractions stay separate and usually there is only one force that is stronger than all the rest. Where we are the major force comes from the Earth, which is noticed when you drop a rock on your foot or jump off a table (don't try this at home).

This is possible via the conservation of momentum. A rocket ejects matter from its back and this matter carries momentum. To conserve momentum the rocket must gain an equal amount of momentum in the opposite direction. Since momentum is related to velocity this causes the rocket to move. This is basically an application of Newton's third law.

You might have been confused with the situation in air. For example an airplane moves through air by pushing air past it (using its propeller). This accelerates the air, and thus increases its momentum. The airplane must therefore gain momentum in the opposite direction, and accelerates itself as well.

The only difference between the airplane and the rocket is that the rocket carries the stuff it accelerates (and ejects) while the airplane can use the air that is already present all around it.

Note that while this is the basic explanation, the situation with the rocket is made somewhat more complicated by the fact that as the rocket loses fuel it also loses momentum because momentum is velocity times mass and the lost fuel lowers the mass of the rocket. You might want to look up Tsiolkovsky's rocket equation if you want more information.

Mass and distance completely determine the gravitational force between

two objects. The force is directly proportional to the product of their masses,

and inversely proportional to the square of the distance between their centers.