Hello everyone. I am having some problem with dark energy and the cosmological constant. The cosmological constant is a proposed form of dark energy. Alright, now the cosmological constant is is estimated by cosmologists to on the order of 10^-26 kilograms per cubic meters. But the density of dark energy calculated from our so far observable universe is 6.91 x 10^-29 kilograms per cubic meters. If cosmological constant is a proposed form of dark energy, shouldn't the density of dark energy be the same as the cosmological constant? Please I need further explanation on this. Thank you!