
Chandra X-ray image of dark energy. NASA/CXC/SAO/A.Vikhlinin et al.
Cosmologists are not sure if dark energy is a new force, a modification of known ones, or even perhaps some kind of matter with bizarre properties that fills all space.
Cosmologists are not sure if dark energy is a new force, a modification of known ones, or even perhaps some kind of matter with bizarre properties that fills all space.