Universe combination of galaxies, stars solar system and planet
Many galaxies constitute a universe
Our universe has about 120 billion galaxies
Each galaxy has about 200-400 billion stars
There are potential 10X500 potential universes
Our universe is just one tiny bubble in a large sea
Milky Way is our solar system
But only earth is suitable for human life
Is only situated in the habitable zone
When ecological concerns are read of earth
Which suits to sustain life; plants animal and human
Earth is the only biosphere that can sustain life
Only earth in this vast domain of universe has life and intelligent life.
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