Gravity

If you could figure out what makes gravity happen you'd likely win a Nobel Prize. Gravity is the weakest of the four natural forces, being billions of times weaker than the other three (electromagnetism and the weak and strong nuclear forces). Basically gravity is the attraction that every particle in the universe has for every other particle in the universe. Matter makes a kind of dimple in the space-time continuum, kind of like placing a ball bearing on a rubber sheet only in three dimensions. If you rolled another ball bearing onto the sheet its path would curve because of the dimple made by the first one. The first one will also tend to roll toward the second one since the second one makes its own dimple. You get the idea. Gravity between two objects decreases as the square of the distance between them so if an object is twice as far then its gravitational effect is 4 times weaker.

the moons gravitational pull is about 1/10 that of earth. that is why astronauts weigh so little on it.

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Standing the same distance from each, with the same mass, the force due to gravity of earth is approx 81 times that of the moon, which incidentally, is also the mass of the earth compared to the moon.

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The comparison of gravity on the surface of each:

1 kg mass on the earths surface = 1 kg force / weight

1 kg mass on the moons surface = 1/6 kg force / weight

Gravity is everywhere. Its strength depends on how close you are to other bodies,

and the mass of the other bodies. If you're way out in empty space, the force can

be quite small, but it's never zero.

The pull of gravity on a rocket decreases as it moves further from Earth. This is because gravity weakens with distance, following the inverse square law, meaning the force of gravity decreases as the distance between the rocket and Earth increases.

To say clouds defy gravity would be misleading, as they do not defy gravity. However rising air currents keep the clouds in the air. The air currents are stronger than the rate at which gravity makes the rain fall (which is not that fast). Clouds are so light, that even the smallest upward air current can make a clouds stay up. Rain falling is basically when the mass of the drops exceed the air currents.

There are roughly 400 billion stars in the Milky Way. The average mass of each of these stars is about half that of our sun, which is about 300,000 times as massive as Earth. Multiplying these numbers gives us the mass of the galaxy compared to the mass of the earth: 150,000 x 400,000,000,000 = 60 trillion. So the gravitational pull of the galaxy is roughly 60 trillion times that of the earth.

Astronauts in space can eat by using special food packages that are designed to be sticky or attached to surfaces. They can also use utensils like forks, knives, and spoons that are attached to their trays with velcro or magnets to prevent them from floating away. Drinks are typically contained in sealed pouches with straws to prevent liquids from floating in microgravity.

Yes; gravity keeps them in orbit in the first place.

Yes; gravity keeps them in orbit in the first place.

Yes; gravity keeps them in orbit in the first place.

Yes; gravity keeps them in orbit in the first place.

Zero gravity can affect the human mind in various ways, such as spatial disorientation, motion sickness, and changes in perception due to the lack of gravitational cues. Astronauts may experience shifts in their sense of balance and spatial awareness, leading to feelings of confusion or disorientation initially until they adapt to the new environment.

Earth's gravitational pull causes the ball to fall back down to the ground after being tossed. The strength of the gravitational pull determines how quickly the ball falls and how high it can be thrown.

Gravity's purpose is to provide a force that governs the motion of objects in the universe, keeping planets in their orbits around stars and holding galaxies together. It is a fundamental force of nature that helps shape the structure and behavior of celestial bodies.

In general, the thing that has the most mass has the most gravity. Mass and gravity are directly proportional. It's that simple. Gravity could be said to be a function of mass. Think about a few things and the mass and gravity associated with them.

A truck has more gravity than a person, who will have more gravity than a mouse. A skyscraper has more gravity than any truck, and the moon has more gravity than any building. The earth has more gravity than the moon, and Neptune has more gravity than earth. Jupiter has more gravity than Saturn, which has more gravity than Neptune. The sun has more still than Jupiter. The sun has more mass than all the planets put together, in fact. And then some!

There are many stars with a greater mass (and therefore greater gravity) than the sun, and black holes have enormous gravity that can easily exceed that of stars. Then there's something called a super-massive black hole, which has a really, really, really large amount of gravity.

Everything that has mass has gravity.

The force of gravity between every two masses depends on both of their

masses. Since it takes the whole earth to produce the force called your "weight"

between you and it when you're standing right on it, the mass of the space

vehicle that you're in doesn't produce much force between you and it.

Another problem is that there are parts of the rocket in every direction from you,

and a lot of those forces cancel each other.

So, technically, there is a force of gravity between the center of you and the

center of your space ship, but it's so small that you don't even notice it, and it

might as well not be there.

That's why whenever you see video from the crew of the Space Shuttle, you'll

notice that they're all holding onto things and staying in one place for the video,

but if you look closely, you'll notice that their hair is floating all over the place,

because there's practically zero force of gravity there.

If you imagine shooting a cannon at a horizontal level, you will see that the cannonball curves toward the Earth as it accelerates "downward" (i.e. toward Earth's surface.)

Now imagine this on a much bigger scale; as the object moves forward, it also get pulled down toward the Earth. Since the Earth itself is curved, the cannonball would never hit the ground. If it was going fast enough, it would simply fall into orbit.

For an illustration to accompany this, see:
http://upload.wikimedia.org/wikipedia/commons/7/73/Newton_Cannon.svg

The gravity on Uranus is weaker than the gravity on earth. There is a small core and a VAST amount of Liquid Hydrogen.

The gravity on Uranus is 8.69 m/s squared.

The gravity on Earth is 9.807 m/s squared.

The planets' gravity on the Sun is insignificant, compared to the Sun's mass; so, within the Solar System, it is (basically) the planets that orbit around the Sun.

On the other hand, the Sun - together with all the planets - orbits around the center of the Milky Way (our galaxy).

The planets' gravity on the Sun is insignificant, compared to the Sun's mass; so, within the Solar System, it is (basically) the planets that orbit around the Sun.

On the other hand, the Sun - together with all the planets - orbits around the center of the Milky Way (our galaxy).

The planets' gravity on the Sun is insignificant, compared to the Sun's mass; so, within the Solar System, it is (basically) the planets that orbit around the Sun.

On the other hand, the Sun - together with all the planets - orbits around the center of the Milky Way (our galaxy).

The planets' gravity on the Sun is insignificant, compared to the Sun's mass; so, within the Solar System, it is (basically) the planets that orbit around the Sun.

On the other hand, the Sun - together with all the planets - orbits around the center of the Milky Way (our galaxy).

of course it does, its gravity is keeping all of the planets, asteroids and comets orbeting

Because space doesn't have an atmosphere.

I disagree, it is due to the fact that most of Space is a vacuum and gravity only works between masses ad a vacuum is not a mass so depending on how far you are from mass, there is either very little gravity or none.

Because they are in orbit which means they have enough forward motion to keep them into a state of "Free Fall". A satellite is falling to earth's center due to gravity. But for every inch it falls toward earth, earth move out of it's way by one inch.

Yes the moon has gravity. How did neil Armstrong stand on it if no gravity?

Gravity is a characteristic of space. Because of it, every material object encounters a force of attraction
toward every other material object. That leads to some interesting consequences:

-- A satellite is attracted toward the earth.
-- You are attracted toward the earth.
-- The earth is attracted toward a satellite.
-- A satellite is attracted toward you.
-- The earth is attracted toward you.
-- You are attracted toward a satellite.
-- Two satellites are attracted toward each other.
-- You are attracted toward Mars.
-- The sun is attracted toward you.
-- The sun is attracted toward a satellite.
-- The sun is attracted toward my dog.
-- You are attracted toward my dog, and also toward the sun.
-- My dog is attracted toward Pres. Obama's golf balls.
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.
.
etc.

A collapsed star is typically referred to as a black hole. Black holes form when massive stars run out of fuel and collapse under gravity, creating a region of spacetime with such intense gravitational pull that nothing, not even light, can escape from it.

You can look it up. If you mean, how do scientists figure it out, they will have to calculate, or estimate, Pluto's mass, and its diameter. Once these are known, the acceleration by gravity can be calculated very accurately. The real challenge lies in finding out those two things.

The diameter can be observed in high-resolution telescopes. With interferometry, a very accurate image can be obtained.

The mass can be calculated by its gravitational effect on other objects, includings its three moons. Perhaps New Horizons will be able to measure the mass more accurately, once it arrives.