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Talk:Starlight problem (view source)
Revision as of 04:12, January 31, 2012
, 04:12, January 31, 2012→gravitationally bound and unbound objects
:::::::Depends what you mean. Existing matter is not expanding. New matter is not appearing from nowhere. However matter is just a kind of energy, and sometimes other forms of energy can convert into matter. So the amount of matter does fluctuate a bit, but the overall energy remains constant. Weirdly, thanks to gravity being negative energy, it remains constant at a value of zero. Who said it had to make sense? --[[User:GeorgeLi|GeorgeLi]] 22:41, 30 January 2012 (EST)
:::::::Depends what you mean. Existing matter is not expanding. New matter is not appearing from nowhere. However matter is just a kind of energy, and sometimes other forms of energy can convert into matter. So the amount of matter does fluctuate a bit, but the overall energy remains constant. Weirdly, thanks to gravity being negative energy, it remains constant at a value of zero. Who said it had to make sense? --[[User:GeorgeLi|GeorgeLi]] 22:41, 30 January 2012 (EST)
::::::::That makes sense and I believe it. Let's return to unbound objects. The space expansion means distance expansion between unbound objects. Is there space expansion and/or changing distances between unbound and bound objects? [[User:RobSmith|Rob Smith]] 22:57, 30 January 2012 (EST)
::::::::That makes sense and I believe it. Let's return to unbound objects. The space expansion means distance expansion between unbound objects. Is there space expansion and/or changing distances between unbound and bound objects? [[User:RobSmith|Rob Smith]] 22:57, 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)
===Rachel & Scott discuss among themselves===
===Rachel & Scott discuss among themselves===