Defying the laws of density

According to a story in the New York Times today, scientists have despaired of getting to the bottom of the mystery of why the universe is expanding in defiance of gravity and the laws of density.

"Having been impelled apart by the force of the Big Bang, the galaxies, in defiance of cosmic gravity, are picking up speed on a dash toward eternity." NY Times - Dark, Perhaps Forever

Astronomers have named the mysterious force "dark energy," for whatever is driving the apparently anti-gravitational behavior on the part of the universe. Nobody claims to understand why it is happening. It is called "dark energy" simply because it is invisible.

Scientists acknowledging there are unseen and unknown forces at work in the universe.

Imagine that.