How Much Does the Universe Weigh?

The cosmological constant problem is one of the biggest problems in theoretical physics today. It says, how much does the universe weigh? And we can use our best theories that describe other areas of physics amazingly well and get a huge number. But it's actually showing us this really tiny observed answer - so those two things don't seem to line up at all. The ratio of the two, the small and the big is 10 to the minus 120.