As the Sachs–Wolfe effect is only significant if the universe is dominated by radiation or dark energy, the existence of voids is significant in providing physical evidence for dark energy.
Kuna Sachsi-Wolfe'i efekt kehtib vaid juhul, kui Universumis domineerib kiirgus või tumeenergia, on tühikute olemasolu oluline tõendus tumeda energia olemasolule.