Origin Of The Earth

Origin

Like the other planets , the Earth is made up of molecules . These molecules were floating around in space , in a cloud of dust left over by the formation of our Sun . At first , just a few molecules clumped together .Then , the clumps began to crash into each other and stick together to make bigger clumps . Later , there were big crashes as pieces of metal and rock hundreds of miles across smashed into each other . There were huge clusters , one such cluster that formed about 150 million kilometers (93,205,678.8 miles ) from the Sun was planet Earth . The planet formation was largely completed in 10 - 20 million years .

Orbit

The Sun's gravity caught the Earth , as well as the other planets , and pulled them into an orbit around it . On one hand , the Earth's momentum was always trying to carry it away from the Sun in a straight line . On the other hand , the Sun's gravity kept pulling the Earth toward the Sun .

As a result ,through centrifugal force , the Earth ended up going more or less in a circle , about 148,059,648 kilometers (92 million miles ) away from the Sun .

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