This is what keeps the planets in orbit right? How come every planet doesn't get sucked into the pull of the sun and get closer to the sun?

Because the force of gravity by the sun is equal to the force required to 'turn' the planet. Imagine swinging a ball by a piece of string over your head. The tension in the string represents the force from the suns gravity which is equal to the force needed to change the direction of the ball. If the forces are equal (well approximately) then there will be no (significant) change in distance.

Because the force of gravity by the sun is equal to the force required to 'turn' the planet. Imagine swinging a ball by a piece of string over your head. The tension in the string represents the force from the suns gravity which is equal to the force needed to change the direction of the ball. If the forces are equal (well approximately) then there will be no (significant) change in distance.

This. The planet wants to continue in a straight line, the gravity pulls it inwards, so as a result it goes between the two forces, and this results in circular motion.

http://en.wikipedia.org/wiki/Centripetal_force

Alright

+1

Centripedal force:

a*R = v^2 (acceleration * radius = velocity^2)

Basic force equation:

F = (G*m1*m2) / R (force = universal grav. constant * mass of object 1 * mass of object 2 divided by distance between them)

Newtons equation:

F = m a (force = mass * acceleration)


Subbing all 3 together, eventually gets you v = sqrt (G*M of sun), where g = 6.67 x 10^-11, and mass of the sun is like 1.0 x 10^31 kg

It goes into something else from there, but thats getting into upper year phys (univ)
Even though some aren't directly related, through a matrix eventually in some HUGE equation that relates the inward velocity to the centripedal velocity you can find out why they go in circles, just doing the math for v = sqrt(GM) won't get anything right.

Centripedal force:

a*R = v^2 (acceleration * radius = velocity^2)

Basic force equation:

F = (G*m1*m2) / R (force = universal grav. constant * mass of object 1 * mass of object 2 divided by distance between them)

Newtons equation:

F = m a (force = mass * acceleration)


Subbing all 3 together, eventually gets you v = sqrt (G*M of sun), where g = 6.67 x 10^-11, and mass of the sun is like 1.0 x 10^31 kg

It goes into something else from there, but thats getting into upper year phys (univ)
Even though some aren't directly related, through a matrix eventually in some HUGE equation that relates the inward velocity to the centripedal velocity you can find out why they go in circles, just doing the math for v = sqrt(GM) won't get anything right.
this^

The same way the moon or satellites don't fall into the earth. (Notice fall, not sucked. I know you know what you mean, but I nevertheless find that kind of inaccuracy annoying.)

Centripedal force:

a*R = v^2 (acceleration * radius = velocity^2)

Basic force equation:

F = (G*m1*m2) / R (force = universal grav. constant * mass of object 1 * mass of object 2 divided by distance between them)

Newtons equation:

F = m a (force = mass * acceleration)


Subbing all 3 together, eventually gets you v = sqrt (G*M of sun), where g = 6.67 x 10^-11, and mass of the sun is like 1.0 x 10^31 kg

It goes into something else from there, but thats getting into upper year phys (univ)
Even though some aren't directly related, through a matrix eventually in some HUGE equation that relates the inward velocity to the centripedal velocity you can find out why they go in circles, just doing the math for v = sqrt(GM) won't get anything right.

That's for a circular orbit. If you want to do a two body problem (i.e. a planet's effect on the motion of the sun and the sun's effect on the motion of a planet) it gets kind of complicated. If you assume the sun fixed (which to a good approximation it is) and then use Newton's law of gravitation (namely, Force due to gravity=GMm/r²) one finds three possible scenarios for the motion of a planet: an ellipse; a parabola; or an hyperbola.

im pretty sure that the earths linear force is not exactly the same as the force pulling it towards the sun.

so wouldnt that mean the the earth is slowly spiraling towards or away from the sun?

im pretty sure that the earths linear force is not exactly the same as the force pulling it towards the sun.

so wouldnt that mean the the earth is slowly spiraling towards or away from the sun?



Hence why I said approximately and significant although i cant find any information on whether the orbit is increasing or decreasing but i imagine it is a fairly small amount.

The same way the moon or satellites don't fall into the earth. (Notice fall, not sucked. I know you know what you mean, but I nevertheless find that kind of inaccuracy annoying.)

Would you be pissed off if someone said suck when referring to a black hole? ex. The spaceship was sucked into the black hole. If you do than that means gravity can suck. And it does suck. I hurt my foot today from a fall. :(

Would you be pissed off if someone said suck when referring to a black hole? ex. The spaceship was sucked into the black hole. If you do than that means gravity can suck. And it does suck. I hurt my foot today from a fall. :(

The reason why I find the use of the term "suck" most annoying is because of its use in referring to black holes, which is entirely inaccurate.

I hope your foot gets better.

your all wrong i found out the truth today THE SUN GOES AROUND THE EARTH!!
http://earthdeception.googlepages.com/
HaHa really i dont know where these people come from but i thought you guys might see the humor in it.

your all wrong i found out the truth today THE SUN GOES AROUND THE EARTH!!
http://earthdeception.googlepages.com/
HaHa really i dont know where these people come from but i thought you guys might see the humor in it.

Hahahahah that's terrific.

your all wrong i found out the truth today THE SUN GOES AROUND THE EARTH!!
http://earthdeception.googlepages.com/
HaHa really i dont know where these people come from but i thought you guys might see the humor in it.

Hmm...."The taproot of bible credibility"....

It's difficult to fathom that this isn't a joke.

your all wrong i found out the truth today THE SUN GOES AROUND THE EARTH!!
http://earthdeception.googlepages.com/
HaHa really i dont know where these people come from but i thought you guys might see the humor in it.

We're all Satanists...

your all wrong i found out the truth today THE SUN GOES AROUND THE EARTH!!
http://earthdeception.googlepages.com/
HaHa really i dont know where these people come from but i thought you guys might see the humor in it.

Something some geocentrists like to point out is that using general relativity, it's possible to model the universe as revolving around the earth. Of course, it leads to some pretty fucked up and inconvenient trajectories to work with, and is obviously a bad way to model the solar system, but i guess they just use whatever science helps their beliefs.

Oh help me.

Gravity is defined as the attraction between two masses in space. The Earth and the Sun orbit each other. However the gravitational attraction of the Earth on the Sun is not equal to the force the Sun exerts on the Earth. Thus the orbital state of the Sun is smaller than that of the Earth. (This is due to the fact that the Earth has a signifcantly smaller mass when compared to the sun.)

Blackholes are an extremely intense gravity well, caused by a nuetron star. The blackhole's gravity is due to the extensive amount of mass it has. Objects can still orbit a blackhole as they do a star, but at a much greater distance. Black holes do not suck, they attract. Suction is defined as the creation of a vacuum which causes airflow. The airflow pulls objects with it through friction of molecules.

Objects in orbit are acting on a principle of centripital force. Where a force of tension draws an object towards a center, while the object maintains its inertia which wants to maintain a steady state movement. (A straight line).