Physicists have new ideas about why the energy of empty space is so much weaker than it is predicted to be.

In every bit of nothing, there is something. If you zoom in on empty space and take out all the planets and stars and galaxies, you might expect a pure vacuum, but you’d be wrong. Instead you would find a dynamic scene, with particles sparking to life and disappearing almost immediately.

Links:
The Cosmological Constant Is Physics’ Most Embarrassing Problem