the universe | Ms.Shorouk Shaaban

............. originated after about 2000-3000 million years of the Big Bang.

• ancestral galaxies

• planets

• galaxies

............. originated after about 5000 million years of the Big Bang.

• hydrogen gas

• the sun

• milky way galaxy

within minutes after the explosion, hydrogen and helium gases are formed by the percentage ................. and .............. respectively.

the sun was born after about ............... million years from the big bang

• 10000

• 5000

• 2000

nebula theory is for the scientist ...............

• fried hoyle

• Laplace

• chamberlain

in Laplace theory, after the gaseous ring cooled it formed ............ while the flaming ball formed ..............

..................... are the group of galaxies that rotate together in space by the effect of gravity.

a wide and extended space where stars , planets and everything is located is ...............

the earliest life forms began to appear after about ..................... miilion years from the origin of the universe.

due to the centrifugal force, the spherical shape of the nebula became ..................