Question regarding gravity

[_hizuka_]

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mga boss, ngutana ko, dba according kay einstien na ang gravity is the result of bending of space/time? then naprove nila na katong sa eclipse na nilikoy ang light around sa moon..... so akong pangutana kung molikoy ang light around sa moon then pasabot ana na ang gravity is in outward direction from the source (in this case. the MOON) that causes the space/time to bend? so kung outward direction ang bending sa space/time dapat nanglutaw na unta ta kay outward mn ang direction sa bending...

unya kung inward pud ang bending sa space/time, then tama na xa kay nipilit man ta sa earth, PERO kung inward ang direction sa bending then WHY ang light nilikoy sa moon?

[rodsky]

mga boss, ngutana ko, dba according kay einstien na ang gravity is the result of bending of space/time?

Bali.

The bending of spacetime is caused by gravity. There's a huge difference between your statement and the correct one.

then naprove nila na katong sa eclipse na nilikoy ang light around sa moon..... so akong pangutana kung molikoy ang light around sa moon then pasabot ana na ang gravity is in outward direction from the source (in this case. the MOON) that causes the space/time to bend? so kung outward direction ang bending sa space/time dapat nanglutaw na unta ta kay outward mn ang direction sa bending...

unya kung inward pud ang bending sa space/time, then tama na xa kay nipilit man ta sa earth, PERO kung inward ang direction sa bending then WHY ang light nilikoy sa moon?

In order to understand this principle, you have to think of gravity nga murag mga depression sa usa ka dako nga rubber sheet (ang rubber sheet kay ang space-time):



So any large-enough nga butang floating in space, mag cause ug depression sa space-time (the rubber sheet). Now akong pangutana--pag tira daw sa jolen (marble) across that rubber sheet pictured above, towards the earth, but not directly at earth (likay gamay ba), tell me if STRAIGHT LINE ba ang path sa imong jolen bi? Dili diba? Mo-curve ang path sa jolen, kay ngano?



Kay curved depression man ang porma sa rubber sheet around the earth, kay tungod lagi sa mass sa earth, na distort ang space time.

So ang path sa LIGHT, when encountering any object nga MASSIVE in space, mo-curve dyud, kay tungod kay na warp man ang rubber sheet (space-time) due to the mass of the planet/star/object nga naa nearby sa path sa light.

Klaro na?

-RODION

[jho1189]

bro, ako lng ni cya ha: (opinion ba, hehe)

number 1: light is not matter so its not affected by any force (e.g gravity).
number 2: gravity is always directed to the center, so for example ang gravity sa earth pdung jd na cya sa center of the earth, no more no less..hehe, dli jd na cya mausab.
number 3: eclipse doesn't do anything about gravity, ang eclipse alignment rna sa sun, moon ug earth, kng kinsay matunga, moreflect ang iyang shadow ngadto sa ikatulong body..hehe
number 4: naglibog lng ko bro, nganong naay slash ang space ug time..unsay pasabot nimo anang slash, space divided by time or space and/or time.

correct me if im wrong, hehe buot2 rsd ni ako bro..haha

[rodsky]

bro, ako lng ni cya ha: (opinion ba, hehe)

number 1: light is not matter so its not affected by any force (e.g gravity).

Wrong. How does gravity alter the trajectory of light? According to Einstein's General Relativity Theory, light will be affected in the same way matter is affected by gravity. This is because under this theory, we should think of gravity not in terms of vector-like forces, but as a consequence of the "shape" of the universe.

From Newton's point of view, gravity was a linearly directed force with which all objects with mass pulled on all other objects with mass. His analysis showed that the strength of the force was proportional to the product of the 2 masses attracting one another, and inversely proportional to the square of the distance between them. Thus an apple and the earth would pull toward each other, and the apple "falls" from the tree. Since light (whether perceived as a ray or a photon) has no mass, Newton's equation predicts that it will not be attracted by gravity towards anything, no matter how massive.

In order to construct a theoretical framework that would be consistent to all observers and that did not rely on some independent fixed reference frame, Einstein had to discard this perception of how gravity works and devise a new understanding. According to this theory, all object with mass alter the curvature of spacetime, the 4 dimensional fabric of the universe. Objects moving through spacetime then simply follow the curves that have been created.

Since human brains are not good at picturing things in 4 dimensions we usually resort to an analogy in 3 dimensions. Imagine spacetime as a sheet of rubber, stretched flat when there is no matter present. If we place a massive object like a star in this "space" it pushes down into the rubber sheet creating a dimple or pit in the rubber. an asteroid flying by the star would not travel in a straight line as it rolled along the sheet, it would curve as it went through the dip, coming out in a new direction. If an object were going just the right speed, it might get stuck in the dimple and travel around the star in an orbit like a ball around a roulette wheel. So far the predictions of this theory are the same as Newton's, but now comes a big difference- if light traveled along this rubber sheet of spacetime, it would follow the curve too, since the curvature of space is already created by the star. In fact if the pit is deep enough and the walls very steep, the light might fall into the pit and never escape. (what we call a black hole) Newton didn't notice this bending of light because it takes very massive objects to get something as fast as light to curve enough that you can notice. This is the same reason we still learn and use Newton's equation - it works well most of the time. But experiments have shown that in fact Newton was wrong and light IS attracted towards object with mass, as Einstein's theory predicted.

number 2: gravity is always directed to the center, so for example ang gravity sa earth pdung jd na cya sa center of the earth, no more no less..hehe, dli jd na cya mausab.

There is nothing in that statement that contradicts anything occuring in nature--it is correct.

number 3: eclipse doesn't do anything about gravity, ang eclipse alignment rna sa sun, moon ug earth, kng kinsay matunga, moreflect ang iyang shadow ngadto sa ikatulong body..hehe

Correct.

number 4: naglibog lng ko bro, nganong naay slash ang space ug time..unsay pasabot nimo anang slash, space divided by time or space and/or time.

Incorrect. I made that error (now corrected) above. The proper way to state spacetime is either one word (spacetime) or space-time is with a dash (-) not a slash (/). Spacetime - Wikipedia, the free encyclopedia

-RODION

[_hizuka_]

Bali.

The bending of space/time is caused by gravity. There's a huge difference between your statement and the correct one.




In order to understand this principle, you have to think of gravity nga murag mga depression sa usa ka dako nga rubber sheet (ang rubber sheet kay ang space-time):



So any large-enough nga butang floating in space, mag cause ug depression sa space-time (the rubber sheet). Now akong pangutana--pag tira daw sa jolen (marble) across that rubber sheet pictured above, towards the earth, but not directly at earth (likay gamay ba), tell me if STRAIGHT LINE ba ang path sa imong jolen bi? Dili diba? Mo-curve ang path sa jolen, kay ngano?



Kay curved depression man ang porma sa rubber sheet around the earth, kay tungod lagi sa mass sa earth, na distort ang space time.

So ang path sa LIGHT, when encountering any object nga MASSIVE in space, mo-curve dyud, kay tungod kay na warp man ang rubber sheet (space-time) due to the mass of the planet/star/object nga naa nearby sa path sa light.

Klaro na?

-RODION

ay baliktad diay pagkasulti nako regarding space/time..."The bending of space/time is caused by gravity." mao na akong pasabot..

ang akong panguta is ang inward/outward bending/direction sa fabric of space/time or ang rubber sheet..... kay sa imong picture na gipakita ang bending sa fabric is OUTWARD which is why ang light molikoy sa earth unya molahos sa iyang agianan dili mablock sa earth ang light... karon kay outward man diay ang bending psabot ba ana na ang gravity nagarepel sa fabric? unya kung inward pud ang bending (which is in our case kay wala man ta nanglutaw palayo sa earth) ang light dili makita nila einstien sa panahon sa ilang experiment, pero nakita man gihapon lage?

to summarize, unsa man jud outward or inward bending?

@jho1189, photon = particles of light = matter.. imong question 2 kay naa nay kinalaman sa akong pangutana....imong question 3 is mali, kay naay kinalaman na sa experiment nila einstien para maprove ang bending of space/time.... imong last question, kay kanang duha partner man

[rodsky]

ay baliktad diay pagkasulti nako regarding space/time..."The bending of space/time is caused by gravity." mao na akong pasabot..

ang akong panguta is ang inward/outward bending/direction sa fabric of space/time or ang rubber sheet..... kay sa imong picture na gipakita ang bending sa fabric is OUTWARD which is why ang light molikoy sa earth unya molahos sa iyang agianan dili mablock sa earth ang light... karon kay outward man diay ang bending psabot ba ana na ang gravity nagarepel sa fabric? unya kung inward pud ang bending (which is in our case kay wala man ta nanglutaw palayo sa earth) ang light dili makita nila einstien sa panahon sa ilang experiment, pero nakita man gihapon lage?

to summarize, unsa man jud outward or inward bending?

@jho1189, photon = particles of light = matter.. imong question 2 kay naa nay kinalaman sa akong pangutana....imong question 3 is mali, kay naay kinalaman na sa experiment nila einstien para maprove ang bending of space/time.... imong last question, kay kanang duha partner man

I honestly do not understand what you mean by outward or inward--it's plain to see that it all depends in your direction...if you're headed towards the planet/star then naturally "inward" imong direction of bending, but after the beam of light (or any other object) passes the planet/star, then "outward" na iyang direction, diba?

And to avoid confusion, do NOT use the term "space/time"...the proper term is spacetime or space-time.

And again I do not understand where you got the notion that "gravity nagrepel sa fabric" because that statement would therefore imply nga gravity is repelling spacetime?

-RODION

[_hizuka_]

I honestly do not understand what you mean by outward or inward--it's plain to see that it all depends in your direction...if you're headed towards the planet/star then naturally "inward" imong direction of bending, but after the beam of light (or any other object) passes the planet/star, then "outward" na iyang direction, diba?

maglisod kog explain basta walay edrawing...pero ani o:
dba mobawg man ang fabric tungud sa kabugaton sa gravity sa object, tama? so kung bug-at ang gravity therefore naa xa direction sa iyang kabug-aton dba? kung basihan nato nang picture nimo na one dimensional ang direction sa kabug-aton sa gravity is downwards mao nang ang light mo likoy pud downwards dili mo direct hit sa earth.

karon ang pangutana nako, unsa jud ang direction sa kabug-aton sa gravity? inward or outward... kung inward ang direction sa gravity dili ta manglutaw sa earth kay inward man ang kabug-aton which means padulong sa center sa earth ang tanan and in that case mo invalidate na ang experiment nila einstien kay ang light dili na molikoy sa earth, instead mo direct hit na sa earth.

summary: if ouward ang kabug-aton sa gravity ang light molikoy around sa earth, BUT manglutaw ta.
If inward ang direction sa kabug-aton sa gravity dili ta manglutaw sa earth, BUT ang light dili molikoy around sa earth (which invalidates einstiens experiment).

[rodsky]

Addendum: After reading your original post, murag nakabalo na ko sa imong problema. You just want to know nganong wala ta "nag lutaw" or "nalabay sa space" if light does pass and "curves around" a massive object like a star or a planet. Ok here are the answers why:

a) We are not made of light. We are made of matter, and thus, we do not travel at photon speeds enough to actually be "whisked away" from the surface of any large body.

b) Once you are within the "funnel" created by the massive body, then you're stuck there. Let's go back to the marble example. If ang jolen nahulog sa earth instead nga gipalikay nato, natural eh ma-stuck jud na sa kiliran sa earth diha sa picture... (let me draw again para klaro):



So in this example, nag "landing" (or nag crash) ang jolen sa earth. So mura tag kanang jolen nga naa sa earth--dili na ta kagawas sa "funnel" kay lawom na man. We need large amounts of energy (hint hint, what is tall and cylindrical and has lots of fuel, and has the ability to escape this "funnel"?) para makabalik ta sa gawas, and sometimes that doesn't even guarantee nga makagawas jud ka totally sa influence sa "funnel" (depression) sa earth.

Again, the reason why light does what it does is because it has special properties--it's made of photons, and thus it has special behavior when it comes to being affected by gravitational attraction. Additionally, imagine if that rubber sheet has a deep hole...dili na planeta...BLACK HOLE na...you think bisan light ka escape niana nga lungag?

-RODION

[_hizuka_]

please refer my post above yours, kay para dili ko mosamot og kalibog kay magsapaw2x atong post..hehe

[rodsky]

please refer my post above yours, kay para dili ko mosamot og kalibog kay magsapaw2x atong post..hehe

I believe natubag na nako imong pangutana, as to why wala ta nag lutaw-lutaw sa space if indeed the theory of relativity is correct.

And yes, naa man dyud light nga mag hit sa earth--whoever said wala? Some light hits the earth, if directly beamed at the earth, wala ma'y contradictory ana. If this weren't true then ngit ngit unta ang daytime, kay wala unta ang kahayag sa sun sa atoang kalangitan.

-RODION