Instead , cosmologists propose a new form of energy called dark energy that permeates all space .
Cosmologists can not explain all cosmic phenomena exactly , such as those related to the accelerating expansion of the universe , using conventional forms of energy .
Cosmologists propose a new form of energy called dark energy that permeates all space .
Cosmologists can not explain all cosmic phenomena exactly , such as those related to the accelerating expansion of the universe , using conventional forms of energy .