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To a universal traveler, Earth may seem to be a harmless little planet in the far reaches of one of billions of spiral galaxies in the universe.
It has an average size star of average brightness and is joined by seven other planets — which support no known life forms — in its solar system.
After 5 billion years of Earth’s formation and evolution, the evidence may have been lost.
But scientists have made significant progress in understanding what chemical processes that may have led to the origins of life.
This is an amazing fact, considering that it is made out of the same matter as other planets in our solar system, was formed at the same time and through the same processes as every other planet, and gets its energy from the sun.
There are many theories, but most have the same general perspective of how things came to be the way they are.
Following is an account of life’s beginnings based on some of the leading research and theories related to the subject, and of course, fossil records dating back as far as 3.5 billion years ago.
The Earth formed under so much heat and pressure that it formed as a molten planet.
For nearly the first billion years of formation (4.5 to 3.8 billion years ago) — called the Hadean Period (or hellish period) — Earth was bombarded continuously by the remnants of the dust and debris — like asteroids, meteors and comets — until it formed into a solid sphere, pulled into orbit around the sun and began to cool down.While this may be fitting for a passage from , by Douglas Adams, in the grand scheme of the universe, it would be a fairly accurate description.