You’re exactly right. In 1993, calculations given at a large symposium showed that there wasn’t enough matter in the universe to cause it to ever contract again. Within 2 years, dark matter had been invented to enable a future contraction. A great sigh of relief was heard at that news.
That’s all well and good, except that dark matter isn’t sufficient to bring a contraction. It is mostly postulated to explain why galactic rotations belie their mass.
You’re exactly right. In 1993, calculations given at a large symposium showed that there wasn’t enough matter in the universe to cause it to ever contract again. Within 2 years, dark matter had been invented to enable a future contraction. A great sigh of relief was heard at that news.
A future contraction, "the big crunch", is not predicted by current models - even with dark matter.
The ‘93 calculation which gave rise to the whole dark matter therory are hugely out of date as much more of the Universe has been “found” since then.