The Big Bang Theory is

A protostar is

Scientists theorize that stars formed

Scientists therorize that heavy elements formed

In a star's theorized life cycle, a supernova occurs when

It is theorized that the solar system

The planets were formed, according to theory

The nebular theory is that

According to nebular theory, Earth and other planets formed due to a process called

The process by which matter became layered according to density during Earth's formation, with heavier matter near the core and lighter material near the crust is called

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