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originally posted by: openminded2011
This is kind of a thought experiment. Lets say you have traveled to the furthest point in the universe where there are stars. Beyond this point is just blackness. So you keep flying past it. At some point, when you have flown so far that you cannot see any stars or galaxies anymore, how would you measure motion? How would you know direction without any physical reference point? Does space cease to exist past the detectable limit of physical matter? Would it just be a dark void that just goes on endlessly? I have always thought that maybe somehow space itself is generated by the presence of matter, and when you pass the last detectable point in space where you can detect matter, space itself ceases to exist. So the universe would have a sort of self imposed boundry, beyond which is "nothing".
'Mind-blowing'/
The theory that invokes these bubble universes - a theory formally called "eternal inflation" - holds that such universes are popping into and out of existence and colliding all the time, with the space between them rapidly expanding - meaning that they are forever out of reach of one another.
originally posted by: openminded2011
This is kind of a thought experiment. Lets say you have traveled to the furthest point in the universe where there are stars. Beyond this point is just blackness. So you keep flying past it. At some point, when you have flown so far that you cannot see any stars or galaxies anymore, how would you measure motion? How would you know direction without any physical reference point? Does space cease to exist past the detectable limit of physical matter? Would it just be a dark void that just goes on endlessly? I have always thought that maybe somehow space itself is generated by the presence of matter, and when you pass the last detectable point in space where you can detect matter, space itself ceases to exist. So the universe would have a sort of self imposed boundry, beyond which is "nothing".