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Yes. I am pretty sure are metaphors. Dark energy seems to be another name for the accelerated expansion itself, and doesn't address an underlying cause for this observed acceleration.

InfantGorilla (talk)15:23, 23 August 2010

Since we don't know what 'Dark Energy' is it is still possible that it isn't a constant force. Theoretically it could decrease in energy over time eventually losing its ability to accelerate the expansion of the universe against gravity. In other words, gravity could eventually get the upper hand to slow and then reverse the expansion (if dark energy is losing force over time) . . .

All to say we can't say CONCLUSIVELY that the Universe will continue expanding forever . . . .

75.57.151.229 (talk)19:05, 30 August 2010

Sounds fair to me. I expect cosmologist's use Occam's razor to eliminate, until calculation or observation prove otherwise, such complexities.

InfantGorilla (talk)19:20, 30 August 2010