How The Life Begin

Cosmic acceleration Independent lines of evidence from Type Ia supernovae and the  CMB  imply that the universe today is dominated by a mysterious form of energy known as  dark energy , which apparently permeates all of space. The observations suggest 73% of the total energy density of today's universe is in this form. When the universe was very young, it was likely infused with dark energy, but with less space and everything closer together, gravity predominated, and it was slowly braking the expansion. But eventually, after numerous billion years of expansion, the growing abundance of dark energy caused the  expansion of the universe  to slowly begin to accelerate. Dark energy in its simplest formulation takes the form of the  cosmological constant  term in  Einstein's field equations  of general relativity, but its composition and mechanism are unknown and, more generally, the details of its  equation of state  and relationshi...