A star's death is determined by its size. The biggest stars will become _______ when they die.

According to scientific theory, the planets in our solar system were created from ?

The source of energy for the sun is _________.

According to scientific theory, the fusion of elements like hydrogen and helium occurs where in space?

How were the heavy elements, those after Iron, created?

What is Earth's thickest solid layer?

What is Earth's thinnest solid layer?

Which gaseous layer is responsible for destroying meteors?

Which gaseous layer is the home of the ozone layer?

Which layer is home to all living things on Earth, and all the Weather?

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