As far as our knowledge is concerned the only place where the life exists is the planet Earth, revloving around the Sun.
The universe was created about 15000 million years back in a big bang. About 6000 millions years ago, our galaxy known as Milky Way was formed along with some other galaxies. The solar system (Sun and planets) were formed about 5000 million years ago. Sun is only an average star among the billions of stars in the ever expanding universe. First micro organism emerged in the depths of oceans on earth about 4000 million years ago. Life on earth is mainly a carbon based life. 30 million years ago, the man-like ape known as hominoid existed in Egypt. After many trasformations, the emergence of modern man took place in the dominant human species in Europe and Asia as Homo neanderthalensis about 250000 years ago. Around 30000 years back, they were driven to extinction by Homo sapiens from Africa, who came into existence between 200000-140000 years ago.
DNA analysis of the Neanderthal remains shows that they cannot be the ancestors of modern man. But the DNA research shows that the modern man has descended from a human population living in Africa between 200000 to 140000 years ago.
All modern humans are genetically similar. But due to the atmospheric and climatic conditions they lived in, different races are formed.
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