The universe is full of matter and the attractive force of gravity pulls all matter together. Granted, the slowing had not been observed, but, theoretically, the universe had to slow. It might have enough energy density to stop its expansion and recollapse, it might have so little energy density that it would never stop expanding, but gravity was certain to slow the expansion as time went on. In the early 1990s, one thing was fairly certain about the expansion of the universe.
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