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Endercreeper01 last won the day on February 6 2014

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  1. That is already a theory. It is called the big bounce: http://en.wikipedia.org/wiki/Big_Bounce
  2. I mean that time dilation on earth is not strong enough such that there would not be large enough effects for the OP's idea to work. If you have atomic clocks, you can observe the difference between time on earth and time in space.
  3. Gravity is not powerful enough on earth to produce noticeable time dilation effects. However, if someone was orbiting a black hole, and escaped after a certain time period, they could experience noticeable time dilation effects that would make them receive new technology in less time than someone on earth.
  4. Gravity cannot be an equal but opposite reaction to the expansion of the universe because the two forces would be equal. The equal but opposite reaction to the expansion of the universe has something to do with dark energy, something not well known about.
  5. In relativity, anything that happens in one point of view applies in all points of view (reference frames). The density requirements would have to increase in your reference frame in order for the same thing to happening both frames of reference.
  6. No field of science is dying. However, it is becoming more challenging to find new species because of the destruction of natural habitats caused by humans.
  7. We could calculate the behaviors of a human through physics, but only if our brains acted classically. If our brains acted quantum mechanically, we would only be able to find certain probabilities that a human will react in a certain way. We do not completely know how the brain works, so we cannot predict anything for now.
  8. Kilograms is not force. Pounds is force, but kilograms are not. If gravity was like magnetism, we would feel a repulsion from negative mass, but we don't. Negative mass does not exist, but if it did, negative mass would repel positive mass and attract negative. If gravity was like electromagnetism, we would see negative and positive mass attract. The centripetal force acts on bodies moving in a circular path. When a planet is orbiting a star, the centripetal and gravitational forces are equal, i.e [latex]\frac{v^2}{r}=-\frac{-GM}{r^2}[/latex]
  9. No black holes with significant electrical charge have never been found. This is because the repulsive force is greater than the attractive force of gravitation when matter with significant charge is compressed.
  10. I know, but I was wondering if the Tipler cylinder would actually allow time travel to the past. I suspect it to be pseudoscience, but I was just asking on the forums to make sure.
  11. I have recently heard of something called a Tipler cylinder, which allows time travel to the past. How is it possible for something to create time travel to the past, according to our current understanding of general relativity? Time is dilated by a factor of [latex]\frac{d\tau}{dt}=\sqrt{g_{00}}[/latex] in general relativity, so how is it possible to make the factor negative?
  12. Do you have any mathematics behind your hypothesis? If it doesn't, it is not a good explanation, as an idea about something in physics requires mathematics.
  13. Light can be slowed down if it travels through a medium. However, no known material makes light static when it travels through it.
  14. We can't travel faster then light because of special relativity. The energy required to accelerate an object to a velocity v is given by [latex]E=\frac{1}{2}mv^2[/latex] In classical mechanics. However, this is only an approximation, and one term in an infinite series. In non-expanded form, the equation for kinetic energy in special relativity is given by [latex]E=mc^2 \left(\frac {1}{\sqrt{1-\frac {v^2}{c^2}}} - 1 \right)[/latex] Where c is the speed of light. As v approaches c, the kinetic energy approaches infinity for something with mass, so we can assume that it takes infinite energy to accelerate a mass to the speed of light. Because it is impossible to have infinite energy, we cannot travel at the speed of light. When you try to plug in a velocity greater then the speed of light into the equation, you end up with a complex number. We do not know what it means to have an energy with an imaginary value, but we are unable to obtain imaginary energy values in other ways, meaning it is impossible to accelerate a non-imaginary mass to the speed of light or beyond. However, it is only impossible to travel at the speed of light in a vacuum. In a medium, light travels slower, although the propagation speed is alway c. Because light is slower in a medium, it is possible to travel faster then it, if you are in a medium.
  15. In special relativity, nothing is able to travel faster then the speed of light. However, if we imagined something traveled faster then light, strange consequences arise. For example, in special relativity, time is dilated by a factor of [latex]\frac{d\tau }{dt}=\sqrt{1-\frac{v^2}{c^2}}[/latex] When the velocity is greater then the speed of light, the time dilation factor becomes imaginary. What exactly would it mean if the time dilation factor was imaginary? What would be observed by a stationary observer if an object did travel faster then light?