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  1. J

    Do photons actually travel ? do photons travel at the speed of light, because i thought that it was impossible for anything to travel at the speed of light
  2. J

    Why do Planets have elliptical orbits ,AND

    what about the dark fluid theory? doesnt it propose that Dark Matter and Dark Energy are not seperate physical phenomena but that they are linked together.
  3. J

    Black hole and wormhole

    could you please explain what a singularity is?
  4. J

    Newtonian Dark Energy

    but if there is already matter outside the observable universe that means tha the Universe is not expanding only the amount of the Universe we can actually see is increasing. also does that mean that there is a finite point to which te Universe can expand??