What makes things fall into the indentations in the warp? Gravity I suppose. Another explanation that doesn't explain anything! Just admit it. We have no idea what makes things fall.
135223
Warping of spacetime, analogy of spacetime as a piece of elastic fabric are just ways to make some mathematical concepts more understandable for laymen. There r hardcore mathematical description behind all these. It doesn't explain anything because u cannot understand the counterintuitive concept behind it and the hard math. It does describe gravity pretty well. Describe. Like all science, it describe. It explains how. It does not explain why. Why is a philosophical, or maybe religious, question.\n\nAnother analogy. An ant walk on a piece of paper. It walk straight ahead. When u bent the paper, u see the ant's path as a curve. If the paper is invisible, it appear as if some force has bent the path of the ant who is just walking a straightline on itself. This is too simplistic but hope u get the picture.\n\nCurvature of spacetime is for description of the geometry of paths. With the presence of gravity, the spacetime get curved, and the geometry of a straightline on a 1 spatial and one time dimentions spacetime becomes a curved line on a 3 spatial and 1 time dimensions spacetime, the spacetime we observe.\n\nWhy would an object with mass has gravitational field around it? why does electron have charges? why does exchange of photons create electric charges? u will never ever get down to the answer because whatever ingredient u used to cook up the answer need to be explain further. it is a never ending process. General Relativity doesn't explain why gravity, but describe how gravity.\n\n\n\n\nthey did not move to spacetime description from Newtonian, in an attempt to explain the why of gravity. They move becoz the spacetime description is more accurate in describing gravity. science cannot really explain why. If one day, they discovered gravitational pull is due to movement of gravitons between masses, the next question would be, why such movement could create gravitational pull. so instead of looking at this as an explanation of WHY, these gravitons would just be a even more detailed DESCRIPTION of HOW gravity works. No scientist know WHY things work. Nobody does. But a lot of scientists do know HOW things work. In the case of gravity, many does.
560500
Science nor anyone else can answer your question! As far as science can determine, our universe (space) is not contained within any 'thing' else. If anyone tries to tell you otherwise, they're just blowin' smoke.
163246
cannot prove or disprove this hypothesis.\n\npast empirical proof has been to tell someone to throw something up and see.  this worked until we started putting things in orbit...and beyond.\n\nnow, how do we know (or not) that those items that have exceeded our known local planetary orbit patterns will not come back because of a larger as yet unforeseen orbit?\n\nif anyone attempts to prove or disprove this it must include a hypothesis that effectively refutes the steady-state universe vs. the big-bang theories.\n\nthis would effectively place matter consumed by black-holes back to the initial "down" and all "up" would eventually return to the same place or "come down."\n\notherwise it is a lie.  technology and our knowledge of the structure of up and down have already effectively refuted this infantile "law" of gravity.  but thanks for reminding us of our humble beginnings in thinking.
209393
It's the matter that provides the gravitational force that stops our galaxies from being flung apart by angular momentum.  It's called dark because we can't see it, but we know it's there because it bends light
115713
gravity.\n\nany shape of mass that is not spherical is gravitationally unstable
167923
Mass (or rather gravity) bends space, as has been proved sometime ago = it works in this way - Imagine a water bed representing space. If you place a heavy canon ball on the water bed, the bed would have an indentation where the canon ball was placed. The area surrounding the canon ball would also be warped towards the canon ball. So if you placed a tennis ball on the bed near the canon ball, the tennis ball would roll downwards and lie touching the canonball. Similarly, huge masses such as the sun, do bend space.\n\nThis is one of examples associated with proving the existence of black holes too.
624135
Galaxies, planets, stars and some moons only spin under gravity and gravitational influence. If the universe is spinning it would require a massive gravational core or gravity core. If so then we will be swallowed by such a force that we wouldn't be here now.\nIn the looks of galaxies, they are being thrown away from the centre of the universe by a force rather than a spin. So if everything is pulling away then if there is a spin there would be gravity and we wouldn't be going outwards we would be going inwards. Nothing else could cause such a force for a spin but gravity and that's impossible and anything else would not function to physics.
662203
There is one, that if you were to do it and found a way to publish the results, a lot of common people would be very interested.  It is the formation and collapse of a gravitational field.\n\nWere you to go to http://timebones.blogspot.com   and then to the November Archive, toward the bottom of that month you shall find "How to Form and Collapse a Gravitational Field".  What I have suggested has been done by myself, but I have never found anyone interested in the results.
57299
We have no idea what happens to any matter inside a black hole. The laws of physics that we know do not apply.
603885
general relativity says that all mass creates "warps" or "gravity wells" in spacetime,and the slope of the gravity wells created by black holes is more extreme than the slope of any other.  it is so extreme that ther is a huge amount of energy in the spacetime itself.  this energy is sufficient for the creation of particle/antiparticle pairs in the form of electrons/positrons.  these have mass and they are formed from the energy created by the warping of spacetime by the black hole.  if one particle is lost in the black hole the other is free to escape, and the escaped particle represents loss mass for the black hole.  less massive a black holes loose more mass than more massive ones because the slope of the gravity well is more severe for less massive black holes so they radiate faster.  finally, the radiation becomes so fast that look like they end their "lives" with an explosion.\n\nhttp://en.wikipedia.org/wiki/Hawking_radiation\n\n\nalso:\nit is true, only non-spherical objects create gravitational radiation, but the mass of the object has to be oscillating. an object has to change shape, or objects have to orbit each other.  if an object has to oscillate between being flattened at the poles and elongated at the poles then it is not a sphere.\n\nhttp://en.wikipedia.org/wiki/Gravitational_radiation
106323
Fact.  Sort of.\n\nWhat is a fact is that every single repeatable measurement of large scale mass shows a very large discrepancy between how much dynamical mass is there (that is to say how much gravity says is there), and how much we can account for using every trick we know (and some we don't).\n\nGalaxy rotation, galaxy cluster temperature, WMAP data, you name it, everything we do to measure dynamical mass of very large objects comes back with us missing large amounds of accountable mass.\n\nEither there is some form of "dark matter" or we are encountering some new aspect of Gravity.  Right now Dark Matter is winning out because no one has been able to come up with a new twist on gravity that gets things right.
193118
It is completely unknown, since we cannot measure it and have no examples-we dont even have any proper theories, since there is also dark energy, and we dont know which of the effects we observe are due to dark matter and which due to dark matter.  We do suspect that dark matter generates gravity, and perhaps generates and anti-gravitational force (though normal mass may also do this at large enough distance)  We also know that it does not seem to block any kind of electromagnetic wave, nor does it generate any that can be detected, so it isnt just something like dust clouds or large planets without stars.
158901
i dont' know what causes the rotation of an orbiting planet, but the moon would definitely have gravity even if it didn't spin.  that dude was full of crap.  if anything, the spin would cause things to fly off.
317241
I was want to make something abundantly clear,\nTHERE IS GRAVITY IN SPACE! (despite what "keelahkat" says).\nGravity is a force of attraction acting between two masses at a distance...any distance.\n\nThe only way one would experience true "zero gravity" would be to travel an infinite distance away from all objects in the universe with mass.
489517
I know the answer is in my basic physics book.  I would have to look it up.  You should too.
301690
Gravity also curves the instruments. The reason that we dont notice this are many. One is that Since we are part of this very space time and that we refer to the curved spacetime to check the curveness of the instrument are the prime reasons
183488
They're actually not perfect.\n\nBut check this link out:\n\nhttp://www.pa.msu.edu/~sciencet/ask_st/031198.html\n\nAnd this:\n\nhttp://www.sciam.com/askexpert_question.cfm?articleID=000D93E1-778C-1C72-9EB7809EC588F2D7&catID=3\n\nThey retain a spherical shape because of gravity.