Gravity

Because fifty years of secret human and animal experimentation, in laboratories,

under water, and in space, have led to the inescapable conclusion, with which

there are no longer any dissenters, that human astronauts are more productive,

more alert, more efficient, and generally happier, and last significantly longer into

the mission, when they're able to breathe, and the resources to do so are provided.

Yes, gravity pulls all objects towards Earth's center, regardless of their density. However, denser substances have more mass per unit volume, so they may sink lower in the Earth's crust due to density variations.

The larger the object, the more 'space' is displaced, and thus, the greater the gravity. The Moon displaces less 'space' than the Earth, so the Moon has less gravity. The space station displaces very little space AND its' shape does not lend itself to taking advantage of the spacial displacement, so it doesn't result in very much gravity.

Stand in a swimming pool and hold a beach ball under the water: the pressure of the water on the ball is a simulation of gravity. Hold a tennis ball under the water: far less pressure, yes? Now, hold something with the exact same collective mass as the beach ball (lets say one of those 'noodle' things the kids play with) and you'll have far less pressure on it than on the beach ball. Why? It has the same mass as the beach ball, so why isn't there the same amount of pressure (gravity) on it? Because the 'shape' of it does not lend itself to take advantage of the gravitational pressure.

Gravity can, however, be simulated with inertia. If the ship spins... centripical force and all that.

Yes, scientific evidence, such as redshift measurements of distant galaxies, indicates that the universe is still expanding. This expansion is believed to be accelerating due to dark energy, a mysterious force that counteracts gravity at large distances.

Christina Anne Knight proposes the existence of a short range force ( the antigravitational force) which is limited to sub-planck length distances in her new book. It is this force which establishes the minimum size of a discrete unit of space (and renders the existence of singularities impossible).

This means that current ideas about black hole structure and the structure of the universe at the Big Bang are wrong. More issues relating to this subject are discussed within this book (including how an unstable relationship between the gravitational and antigravitational forces is responsible for the perpetual cyclic expansion and contraction of the universe and for the evolution of cosmic parameters). In addition, it is this unstable relationship between these oppositional gravitational forces which produces a cosmic thermodynamic gradient which is reduced during the expansion phase of the cosmic cycle (and is responsible for all of the complexity we see around us).

Not always. The force of gravity is given by Newton's Law of Universal Gravitation:

F=(Gm1m2)/r2

So if a planet had twice the mass of the earth, and the same radius, gravity would be twice as strong.

However, if you had a huge planet that weighed the same as the earth (let's say it had a radius 3x greater), then gravity would be 9 times weaker at the surface.

The reason big planets like Jupiter have so much gravity is becuase they have A LOT more mass than the earth does.

Of course there is gravity in Australia. There is gravity everywhere on the planet.

Acceleration due to gravity is less on the Moon compared to Earth because the Moon has less mass than Earth. The force of gravity is directly proportional to the mass of the celestial body, so a smaller mass like the Moon results in weaker gravity. This causes objects to fall more slowly on the Moon than on Earth.

The same way you "beat the pull of gravity" to move yourself from the first floor

up to the second floor. You exert an upward force on your body greater than the

force that attracts the earth and your body toward each other, and the result is

that they separate. This can be accomplished using an escalator, elevator, winch-

line, staircase and leg muscles, etc.

Theists have always held that God was responsible for the creation of the universe. Stephen Hawkin now says that gravity was responsible for the "Big Bang" and therefore the creation of the universe. One way of looking at this is that God is gravity. Of course, theists would not accept this simplistic conclusion.

The center of gravity is the point where the weight of an object is concentrated. When the center of gravity is properly aligned over the base of support, it helps to maintain balance. If the center of gravity is outside the base of support, it can cause the object to tip over.

Gravity was the first force to split from the other three fundamental universal forces (these being the electromagnetic, strong nuclear and weak nuclear forces) during the early expansion of the universe - around the end of the Planck epoch - through phase transitions of symmetry breaking. This basically defined the gravitational relationship among the others as we know it today, and hence gravity as a unique force has existed for the entirety of the known universe.

However, beyond that, gravity is at best hazy and at worst unexplainable because of those same definitions and properties. Active research includes gravity and how it works as a major focus, with efforts so far unable to unify it with the other three forces.

Gravity affects anything with a weight. Take a feather for example; it may fall slowly if you drop it, but the speed has nothing to do with gravity. It is infact air resistance that slows the feathers descent. weightless things like gases have no gravitational pull, so they are able to move about freely in the air. I hope that wasn't too confusing :S

There is nothing special about the center of the Earth itself; the attraction is in that direction, due to the accumulated effect of the attraction from different parts of the Earth.

At the center of the Earth itself, the gravitational attraction towards the left, for example, by some pieces of planet Earth, would be exactly compensated by gravitational attraction towards the right, by other pieces of the planet.

Gravity holds the Earth and its atmosphere together, allowing the sky to remain in place around our planet. This force also influences the movement of clouds and the behavior of celestial bodies, such as the sun, moon, and stars, in Earth's sky.

Gravity is strongest at the center of the Earth because the mass of the entire planet is concentrated in that location. This concentration of mass creates a gravitational force that pulls objects towards the center. This is why objects, including ourselves, feel a force pulling us towards the Earth's core.

Gravity affects your brain by constantly pulling it downward, causing the brain to be anchored in place within the skull. Over time, this can lead to compression and deformation of brain tissue, as well as increased pressure within the skull. Additionally, gravity influences blood flow in the brain, with more blood pooling in the lower regions when standing upright, potentially impacting cognitive function and overall brain health.

The mass of an object remains constant regardless of the force acting on it, including Earth's gravitational pull. Weight, on the other hand, is a measure of the force exerted on an object by gravity, which can vary depending on the strength of the gravitational field (like on different planets).

No, the increased gravity would make it harder for people to float on water. The extra force pulling them down would make it more difficult for them to displace enough water to stay afloat without some external support.

Any time a person falls, they experience reduced gravity for a short time.

If they fall a greater distance, the more likely they will experience something close to zero G.

Sky diving, riding a roller coaster/ amusement park ride with a free fall component can get close to zero g. If you've been in a plane that hit turbulence and dropped quite a ways, you may have experienced zero gravity.

Point is, zero is experienced during free fall, which is exactly what the astronauts are doing when they are in orbit.

Yes, all galaxies in the universe are bound by the force of gravity, which governs their interactions with one another as well as their internal structure and motion. Gravity is the dominant force shaping the formation and evolution of galaxies over cosmic timescales.

Most rockets are intended to get out of Earth's atmosphere, but many do come back down eventually.

Those that don't either have enough velocity and acceleration to get beyond enough Earth gravity to leave its orbit; others are set to exactly arrive at a particular orbit and stay there. This occurs because they are moving away from Eartha t the same rate they fall towards it.