hi, I have been watching some "world science festival" videos on youtube, also there were a conversation pertain to whether or not the cosmological constant should be a constant. As far as I know, our universe is expanding with a positive acceleration measuring the red shifts, and it implies that net total energy should not be constant in a given time. Nevertheless, there was a situation that a guy in videos said that data they had acquired resembled the cosmological constant. Is not there a contradiction???????. Because they say both the our universe is expanding and data they had acquired resembled the cosmological constant (static universe, net total energy is constant).