RE: "our calculation on the effects of dark energy could be wrong"
"Firstly, our calculation on the effects of dark energy could be wrong. Dark energy, which can't be detected on current instruments, is already causing the expansion of the universe and may have additional properties that theorists haven't accounted for."
Surely the fundamental problem is that we don't know what Dark Energy is, or have anything like a coherent theory of how it works - so what chance is there that our "calculations" (guesswork?) would be right?!