Final answer:
The Sun formed first in our solar system, followed by the solar nebula. Next, planetesimals began to form. Lastly, the inner planets, including Earth, formed.
Step-by-step explanation:
The Sun formed first in our solar system. It is the main source of heat and light, and its formation marks the beginning of our solar system. The solar nebula formed next, which was a rotating cloud of gas and dust. Within the solar nebula, the planetesimals began to form through the process of accretion, which is the gradual accumulation of matter. Finally, the inner planets, including Earth, formed after the planetesimals collided and fused together to create larger bodies.
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