Is it true that there is "zero" gavity on outer space?
373232
No, A BIG NO. even on outer space, the gravity is NOT zero. It is very near to Zero (maybe like 0.0000000000000000000001 or something), but never exactly zero. This is because gravity has a range of infinite, i.e. the effect of gravity reaches to every place in the universe and even more. However, it is also known that gravity's power is inverse square to the range (S/4*pi*a_huge_distance^2 = almost 0, but never exactly 0, unless S=0 which means there is no gravity source), thus after a certain distance, the effect of the gravity is negligible and won't affect almost anything. BUT it is not zero. There is no point in space that have completely zero gravity, if there is at least one gravity source in that space, even if the gravity source is placed very far away from that point or even if the gravity's power is very small.\n\nThe gravity is similar to light in this way of infinite range. If you fire an ideal laser (one that would not spread out even minutely after great distances), and you stand on a very far away point from the laser, you'd still be able to be pointed by the laser. Light is also a force that have an infinite distance. Light however, is not exactly the same as gravity.
519173
Actually, There is no such thing as a true vacuum...Anywhere.\nA true vacuum has never been created, anywhere, where the atomic count is zero.\nThere is always atomic content left to fill the "vacuous" space. No one has ever been able to creat a true vacuum.\n(exerpt from a previous answer)\nContrary to popular belief, empty space is not empty, and it is certainly not a vacuum. \nresearch it, its true.\n"Empty" space actually contains an average of 1 hydrogen atom for every 32 cubic centimeters of space, this data is per NASA.\n\nIn our own Milky Way, space is more dense with 1 hydrogen atom for every 1 cubic centimeter.\n\nThe universe is probably scheduled for a "Big Crunch". It is possible that black holes are the catalyst behind the big crunch, which is the end version of the big bang. Once all of the black holes in existence in our universe collect enough matter and energy, they could theoretically combine gravitationaly to create one massive black hole that simply repeats the big bang over and over.\n\n\nOne day the misinformation of space, or anything else, as a vacuum will finally die out.\n\n\nspread the knowledge
251506
of your choices, the one "no heat engine can be 100% efficient" is most correct, isn't it? But doesn't it primarily derive from second law, and the third law is that "absolute zero" is unattainable? [though in a tiny space, the University of Florida is testing a theory that a random tiny state would be possible, at "no motion", hence, absolute zero]
770211
each and every material is pulled towards the centre of the earth due to gravitational force.  since the object itself is placed at a depth equal to the radius of the earth, which means it is placed at the centre of the earth, it would not be pulled towards any point and hence the gravity at that point is zero.  when gravity is zero, naturally the weight is also zero.  but remember, there won't be any change in the mass of the body.
1068202
Zero gravity is impossible on earth.  Actually, zero gravity is impossible anywhere.  Gravity acts through millions of light-years, holding galaxy groups together, so there's no way that you can eliminate gravity this close to a major mass like the earth.\n\nHowever - you CAN have a situation that is mathematically and physically equivalent to zero gravity, and that is free fall.  Jump on a trampoline, you'll spend a few fractions of a second in free fall, which is just like zero-G.  NASA does it with the Vomit Comet, which is a modified KC-135 aircraft that flies in parabolic paths to give astronauts-in-training a freefall experience.   NASA also has a (mis-named) test site called the "Zero Gravity Research Facility."   See the last link, below, for more info about this 500-foot tall drop test site.
1041594
Things that are orbiting our planet are in a state of constant "free fall". That is why they appear to be weightless. The force of gravity is still very high on the astronaut.
32023
i think u have to go to a room with a tempreture of absolute zero (O Kelvin) then decrease the gravity that the molecules could move faster than light by the way u could race time by this method\np.s. this is only a theory
730247
Yes, there is gravity at the center of the earth, but it would exert the same force in all directions at once, resulting in a net acceleration of zero.  Therefore, yes, you would float in the same manner as if you were in outer space.
954663
it has gravity indeed, but less than earth\n\n:> peace\n.
836797
If you are asking about anti-gravity cos you've seen an episode of star trek who's anti gravity engines run on anti matter then the answer is NO.\nI saw a program on the Sci-fi channel a few years back and an American guy had made a circular pad with about 1 metre radius which once turned on you could put any thing on it and it would just float in mid air, this guy just built it at his own leisure.\n\nThe question of moving at light speed is impossible for nearly anything except light, scientist now believe that it would be more feasible to bend space around an object so it would instantaneously leave one point in space and reappear in another
6613
Quantum physics predicts the existence of an underlying sea of zero-point energy at every point in the universe. This is different from the cosmic microwave background and is also referred to as the electromagnetic quantum vacuum since it is the lowest state of otherwise empty space. This energy is so enormous that most physicists believe that even though zero-point energy seems to be an inescapable consequence of elementary quantum theory, it cannot be physically real, and so is subtracted away in calculations. \n\nA minority of physicists accept it as real energy which we cannot directly sense since it is the same everywhere, even inside our bodies and measuring devices. From this perspective, the ordinary world of matter and energy is like a foam atop the quantum vacuum sea. It does not matter to a ship how deep the ocean is below it. If the zero-point energy is real, there is the possibility that it can be tapped as a source of power or be harnassed to generate a propulsive force for space travel. \n\nThe propellor or the jet engine of an aircraft push air backwards to propel the aircraft forward. A ship or boat propellor does the same thing with water. On Earth there is always air or water available to push against. But a rocket in space has nothing to push against, and so it needs to carry propellant to eject in place of air or water. The fundamental problem is that a deep space rocket would have to start out with all the propellant it will ever need. This quickly results in the need to carry more and more propellant just to propel the propellant. The breakthrough one wishes for deep space travel is to overcome the need to carry propellant at all. How can one generate a propulsive force without carrying and ejecting propellant? \n\nThere is a force associated with the electromagnetic quantum vacuum: the Casimir force. This force is an attraction between parallel metallic plates that has now been well measured and can be attributed to a minutely tiny imbalance in the zero-point energy in the cavity between versus the region outside the plates. This is not useful for propulsion since it symmetrically pulls on the plates. However if some asymmetric variation of the Casimir force could be identified one could in effect sail through space as if propelled by a kind of quantum fluctuation wind. This is pure speculation. \n\nThe other requirement for space travel is energy. A thought experiment published by physicist Robert Forward in 1984 demonstrated how the Casimir force could in principle be used to extract energy from the quantum vacuum (Phys. Rev. B, 30, 1700, 1984). Theoretical studies in the early 1990s (Phys. Rev. E, 48, 1562, 1993) verified that this was not contradictory to the laws of thermodynamics (since the zero-point energy is different from a thermal reservoir of heat). Unfortunately the Forward process cannot be cycled to yield a continuous extraction of energy. A Casimir engine would be one whose cylinders could only fire once, after which the engine become useless. \n\nORIGIN OF ZERO-POINT ENERGY \n\nThe basis of zero-point energy is the Heisenberg uncertainty principle, one of the fundamental laws of quantum physics. According to this principle, the more precisely one measures the position of a moving particle, such as an electron, the less exact the best possible measurement of momentum (mass times velocity) will be, and vice versa. The least possible uncertainty of position times momentum is specified by Planck's constant, h. A parallel uncertainty exists between measurements involving time and energy. This minimum uncertainty is not due to any correctable flaws in measurement, but rather reflects an intrinsic quantum fuzziness in the very nature of energy and matter. \n\nA useful calculational tool in physics is the ideal harmonic oscillator: a hypothetical mass on a perfect spring moving back and forth. The Heisenberg uncertainty principle dictates that such an ideal harmonic oscillator -- one small
699573
Yes it is with radius of curvature = ∞\n\nHigher geometry takes this for granted
34602
ALthough the exact distance at which the Earth's atmosphere (the 'sky') loses influence is debated, the atmosphere does end, so yes there is a limit to the sky.  As for space, space is most likely finite in size, but since it is expanding at such great speed, relative to someone in a spaceship, space would appear unlimited.
323244
This is conceivable, but only in a very low/no gravity environment.  Thanks for your thoughtful question.
483739
Absoultue zero in terms of Kelvin is impossible to obtain because there can never be nothing
1121006
Gravity waves have a frequency.  That's a good point about destructive interference.  I hadn't thought about that.  However, from what I understand, there should be gravity waves generated by two co-orbiting large bodies.  If you think about it, their gravity would increase and decrease if that was the case, but always remain far above zero.  So....if you could cancel it with a gravity wave generated by another source that was identical and just out-of-phase, you should still have a baseline gravity that was nonzero.  \n       In other words, no negative gravity (that I know of) so when it cancels, it's not zero.
436694
Technically no.  As you get closer and closer to the speed of light the weight of objects grows and grows so that eventually it will stop accelerating.\n\nOne thing that is possible is subspace, freespace, or wormhole travel, all of which are the same thing.  This is where space bends so that the distance is made shorter.  An example of this is traveling to the other side of the world.  You can go around the world, or you can go straight through the center (this is impossible), which distance is shorter.  To achieve subspace travel you must open up a big enough portal of quantum foam, or the space between the nucleus of an atom and its electrons.  We can not currently do this because we do not have the ability to make cold fusion which is the only 'safe' way to supply enough power.  Navigation, however, is a completely other story.\n\nhope this helps answer your question.