evolution
evolutionary biology is the study of
history of life form on earth
stellar distance are measured in
light years
look at starrs in sky means
looking back in time
when we see objects in our surrounding we see them
instantly and hence in present time
which is considered as unique event in the history of universe
orign of life
which is vast and which is speck
universe-vast
earth-speck
how old is universe
20 billion yrs
universe is comprised of
huge cluster of galaxies
galaxy contain
star ,cloud of gas and dust
considering the size of _earth is speck
universe
origin of universe is explained by
bigbang theory
bigbang theory
single huge explosion
unimaginable in physical terms
after bigbang theory what happened
universe expanded
temperature came down
which are formed sometimes later after the universe expanded and temperature came down
hydrogen and helium are formed