CRONOLOGY OF THE UNIVERSE :-
The initional hot and
dense state is called the PLANKepoch , a brief period extending from
time zero to one Planck time unite of approximately 10-43 seconds.
During the Plank epoch , all types of matter and all types of energy were concentrated into a dense state, where gravitational is believed
to have been as strong as the oyher fundamental forces , and all the forces may
have been unified. Since the Plank epoch ,the Universe has been expanding to
its present form, possibly with a very brief
period of cosmic inflaction which caused the Universe to reach a much
larger size in less than 10-32 seconds.
HISTORY OF TIME &
UNIVERSE:-
After the Plank epoch
and inflaction came the quark , hadron , and
lepton epochs. Togather
,these epochs encompassed less than 10 second of time following the Big Bang.
The observed abundance of the elements can be explained by combing the overall
expansion of space with nuclear and atomic physics. As the Universe expands , the energy density of
electromagnetic radiation decreases more quickly than dosethat of matter because the energy of a photon
decrease with its wavelenth . as the
Universe expanded and cooled , elementary particles associated stably in to
ever larger combinations.
