Changes

:::::::::Well yes. Distance is just a word for the size of dimensions in space. Like I said earlier, if you're a megaparsec away from something and not gravitationally bound to it the distance is increasing at about 74 km/s. However between bound objects there is no expansion. Distances might change, but only because of normal motion. Even Newtonian mechanics gives a good approximation of that. --[[User:GeorgeLi|GeorgeLi]] 23:12, 30 January 2012 (EST)

:::::::::Well yes. Distance is just a word for the size of dimensions in space. Like I said earlier, if you're a megaparsec away from something and not gravitationally bound to it the distance is increasing at about 74 km/s. However between bound objects there is no expansion. Distances might change, but only because of normal motion. Even Newtonian mechanics gives a good approximation of that. --[[User:GeorgeLi|GeorgeLi]] 23:12, 30 January 2012 (EST)

:::::::::: A group of bound objects, like a galaxy, will experience expansion relative to other galaxies to which it is not gravitationally bound. That is why we see far away galaxies expanding away from us, but not the galaxies in our Local Group. [[User:RachelW|RachelW]] 23:15, 30 January 2012 (EST)

:::::::::: A group of bound objects, like a galaxy, will experience expansion relative to other galaxies to which it is not gravitationally bound. That is why we see far away galaxies expanding away from us, but not the galaxies in our Local Group. [[User:RachelW|RachelW]] 23:15, 30 January 2012 (EST)

===Rachel & Scott discuss among themselves and wait for Andy to cite his sources===

===Rachel & Scott discuss among themselves and wait for Andy to cite his sources===