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Originally posted by jiggerj
GRRRRR! I know I've seen images the voyager took of the sun as the satellite was 3 billion miles away, but I can't find them! I wanted to use them for this question, but now I'm so aggravated I'm just going to ask:
We see illustrations of how the sun warps space-time and the earth is caught within that field. If warping space-time actually exists, how can the sun possibly be warping space-time as far out as Neptune, which 4.5 BILLION miles away? Seems like a huge stretch of the imagination there. Yes? No?
Originally posted by TiM3LoRd
Originally posted by jiggerj
GRRRRR! I know I've seen images the voyager took of the sun as the satellite was 3 billion miles away, but I can't find them! I wanted to use them for this question, but now I'm so aggravated I'm just going to ask:
We see illustrations of how the sun warps space-time and the earth is caught within that field. If warping space-time actually exists, how can the sun possibly be warping space-time as far out as Neptune, which 4.5 BILLION miles away? Seems like a huge stretch of the imagination there. Yes? No?
I think I understand your query. Are you asking why if the sun has so much influence over objects so far away it doesnt jul pull into a declining orbit the smaller planets closer to it? Or vice versa why dont the larger planets fly off into deep space? Is that what your asking?
Originally posted by TiM3LoRd
Originally posted by jiggerj
GRRRRR! I know I've seen images the voyager took of the sun as the satellite was 3 billion miles away, but I can't find them! I wanted to use them for this question, but now I'm so aggravated I'm just going to ask:
We see illustrations of how the sun warps space-time and the earth is caught within that field. If warping space-time actually exists, how can the sun possibly be warping space-time as far out as Neptune, which 4.5 BILLION miles away? Seems like a huge stretch of the imagination there. Yes? No?
I think I understand your query. Are you asking why if the sun has so much influence over objects so far away it doesnt jul pull into a declining orbit the smaller planets closer to it? Or vice versa why dont the larger planets fly off into deep space? Is that what your asking?
Originally posted by SpearMint
Gravity warps time. If something is in the Sun's orbit, it's being affected by it's gravitational pull.
Originally posted by artistpoet
reply to post by jiggerj
Imagine ripples in a pond how far the initial dropped stone or Sun's influence spreads
edit on 6-5-2012 by artistpoet because: (no reason given)
Originally posted by jiggerj
Originally posted by artistpoet
reply to post by jiggerj
Imagine ripples in a pond how far the initial dropped stone or Sun's influence spreads
edit on 6-5-2012 by artistpoet because: (no reason given)
The ripples would push the planets away. And please keep in mind we're talking about OVER FOUR BILLION MILES between the sun and Neptune.
Also, what's keeping all the rocks in the Kuiper Belt hanging around?
Originally posted by ImaFungi
reply to post by jiggerj
the sun is huge compared to planets.. its diameter is almost a million miles.... if it is effecting the planets enough for them to orbit the sun via gravity, why is it hard to imagine the space around the planet and in-between is effected by the sun...
Originally posted by artistpoet
Originally posted by jiggerj
Originally posted by artistpoet
reply to post by jiggerj
Imagine ripples in a pond how far the initial dropped stone or Sun's influence spreads
edit on 6-5-2012 by artistpoet because: (no reason given)
The ripples would push the planets away. And please keep in mind we're talking about OVER FOUR BILLION MILES between the sun and Neptune.
Also, what's keeping all the rocks in the Kuiper Belt hanging around?
Lol OK - Then imagine stirring a cup of coffee
Or Watch the water run down a plug hole
Or have a cup of coffee and nice warm bubble bath then pull the plug
Originally posted by ImaFungi
reply to post by jiggerj
the sun is huge compared to planets.. its diameter is almost a million miles.... if it is effecting the planets enough for them to orbit the sun via gravity,
Originally posted by ImaFungi
reply to post by jiggerj
even 1 billion miles is a lot lot lot further then these distances...
Mecury >> 36 million miles
Venus >> 67 million miles
Earth>> 93 million miles
Mars>> 142 million miles
Jupiter>> 483 million miles
Saturn>> 888 million miles
Uranus>> 1,784 million miles
Neptune>> 2,794 million miles
Even though they dont call Plato a planet any more, its>>> 3,647 million mile
www.rayfowler.org...edit on 6-5-2012 by ImaFungi because: (no reason given)
Originally posted by CLPrime
reply to post by jiggerj
The Sun warps space out to an infinite distance. This warping approximately follows the inverse square rule: at twice the distance, the force of gravity is 1/4 as strong.
Neptune is 30 times further out from the Sun than the Earth is. That means, at that distance, the force of gravity is 1/(30^2) = 1/900 the strength it is here.
If you know what a force is, you'll know that it's the amount of "push" needed to accelerate a certain mass by a certain amount: F = ma, where F is the force in Newtons, m is the mass in kg, and a is the acceleration of the mass in m/s^2.
Also, you should keep in mind that it is a force that keeps a planet in orbit - specifically, centripetal (center-seeking) force. Even more specifically, that centripetal force here is the gravitational pull of the Sun.
So, the force at the distance of Neptune is 1/900 the strength it is here at the distance of the Earth. That's the centripetal force that holds Neptune in its orbit.
Recalling that F = ma, rearranging that gives the acceleration as a = F/m. That means the centripetal acceleration of the orbiting planet is proportional to the force of gravity at that distance. At the distance of Neptune, then, the centripetal acceleration is much less than it is at the distance of the Earth.
Now, centripetal acceleration is equal to (v^2)/r, where v is the orbital velocity of the planet and r is its distance from the Sun. Orbital velocity is proportional to the square-root of the centripetal acceleration. That means that the orbital velocity of Neptune will be proportional to the square-root of 1/900, or 1/30, as compared to the orbital velocity of the Earth.
Ultimately, this is what I'm getting at: the only thing that must be satisfied in order to keep Neptune in an orbit around the Sun is that particular orbital velocity. Any slow and it falls into the Sun; any faster and it will fly off into space.
You will find that this is true by checking the orbital velocity of Neptune as compared to the Earth. For the Earth, it's 30 km/s; for Neptune, it's 5.43 km/s. The fact that Neptune's orbital velocity isn't exactly 1/30 that of the Earth is because it's more massive. If the Earth suddenly found itself out at the distance of Neptune, its new orbital velocity will be exactly 1/30 what it is now, which would just happen to be 1 km/s.
As I said, the gravity well of the Sun extends out to infinity. Any object, even one millions of light-years away, can conceivably enter into an orbit around the Sun. However, at that distance, too may other stars get in the way.