Hi astromark: I don't understand much of this either. More numbers would be helpful such as the 67% dark energy suggested by Antoniseb. If that was 60 percent in 1907, we have reason to worry. If it was 60 percent 13 billion years ago, and linear, we still have perhaps 50 billion more good years. Same for the Hubble constant, I think. If it has gone from 60 to 67 (linear) in the past 13 billion years, we should still have perhaps 50 billion more good years. While our sun likely will last only about 1/10 th that long, a few humans can likely move to the outer solar system, or even to other solar systems, so we don't all have to die when our sun becomes a red giant. Neil