cosmology is the science of universe and large scale structure of it.it begin in studies extensively by the begining of the 20th centuary by Albert einstien.
the general theory of relativity which had sufficient ideology to construct mathematical models of the universe.
and it given strong base by Edwin hubble’s own measurements of hus constant.
The age ofuniverse is approximatly about 13 billion years.
it was in the midst of this chaos that the hubble space telescope was launched 1990.the hubble’s space telescope was on the high side implying a rather young universe,also depending on what theoretical mode is accepted.Scientists say the universe could be just 8 billion years old if the hubble constant is precisely 80.