What are we made of? Tissues and cells. But what are tissues and cells made of? They are actually molecules and atoms. Atom, from its original name Atomos in Greek which means uncutable, indivisible or couldn't be further broken down. The smallest particle that builds everything in the universe.
All of the atoms in the universe was created during The Moment of Creation, The Big Bang. Through the process of physics and chemistry, they were recycled over and over again since 14 billion years ago when the universe was created almost instantly.
The oxygen that I breath in now might be the oxygen atoms that was once breath out by Isaac Newton or even a dinosaur. When I die and if I am buried, part of me might find its way into an animal or a plant. The animal or the plant might be consumed by a human being. If my body is burnt and my ashes are thrown into the sea, I might even reach farther.
Many religions always told us that we are made of earth's dust and eventually our body returns to earth when we die. True but that is just a small part of a story of the universe. Some of the minerals in my body might be from the asteroids that punches Earth during the Late Heavy Bombardment about 4 billion years ago. And during the early age of our solar system about 4.5 billions years ago, our planet collides with another planet of a size of Mars, called Theia. Most of Theia's mass ended in Earth and the rest of its fragments were ejected into the orbit around earth and later formed the Moon.
Not only we are part of the Earth, we are part of the universe. One day we will eventually return to the universe. The recycling process will keep on going until The Big Rip, the ultimate fate of the universe, the end of time.
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