Thread:Comments:Scientists conclude that the universe may expand forever/Curses!/reply (7)

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. . ..