GENERAL KNOWLEDGE

Detailed explanation-1: -The curve changes noticeably about 7.5 billion years ago, when objects in the universe began flying apart as a faster rate. Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart.

Detailed explanation-2: -The even distribution means that dark energy does not have any local gravitational effects, but rather a global effect on the universe as a whole. This leads to a repulsive force, which tends to accelerate the expansion of the universe.

Detailed explanation-3: -It is called “dark” because it must necessarily be very weakly interacting with regular matter–much like dark matter–and it is referred to as energy because one of the few things we are certain of is that it contributes nearly 70 percent of the total energy of the universe.