I have learned how the Earth and the universe on how it was formed and it was from a Big Bang which then suddenly out there it exploded and spitted out planets and stars, giving birth to life. Earth was also created by Planetary Accretion and Radioactivity. Planetary Accretion is, the breaking of nuclei shooting off to high speed, hitting other nuclei and making them hot and all the smaller particles. Radioactive decay releases heat, keeping the Earth's core hot, which then causes continental drifts. Radioactivity may also be the cause on how the Earth release the gases which made the 1st atmosphere. So the Earth is billions of years old and many scientist are interested in the past Earth, extinction, organisms, and species.
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