On a deeper level, the scientists don't know what the heck they are talking about. Their theories and observations have led to a view of the universe that is way beyond common sense and starts to sound like magic, or God.
Just one teeny weeny example. The "cosmological constant" either doesn't exist, or they have no idea what it is. Their observations of the universe don't match what should be the behavior of the "stuff" they know to exist, so the cosmological constant is a number thrown in to make up for the difference. They have no idea what it is or if it is real.
"The "cosmological constant" either doesn't exist, or they have no idea what it is."
As further proof, the Cosmo...Constant is a variable.