How did our planet come into existence? According to the widely accepted Nebular Hypothesis, the Earth formed around 4.6 billion years ago from a rotating cloud of gas and dust left over after the formation of the Sun. Through gravity, this dust began to clump together, forming planetesimals. These collided and merged over millions of years, eventually forming the Earth. Intense heat from radioactive decay and impacts caused the early Earth to melt, allowing heavier elements like iron to sink an