Your Left Hand might be of Different Origins than Your Right One. Here's Why.

What if I told you that there is a chance that your left hand comes from a completely different origin than your right one?

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Script:
I want you to take a look at your left hand. Where do you think it came from? It didn’t just appear, cause like everything else it came from somewhere. It was built, bit by bit.

That’s right! We are made of itty-bitty, microscopic building blocks, called atoms. Now take a look at your right hand. Do you think that it came from the same origin as your left hand? Or the same building blocks? Well, what if I told you that, there is a chance that your right hand comes from a completely different origin than your left hand. Now, I know what you’re thinking… Don’t worry, it’ll all make sense at the end.

So, in talking about hands, we want to ask the question. Is it possible that the atoms in your hands came from different origins? And how is that possible?

In order to answer this question, we have to look at the bigger picture. And don’t worry, we don’t mean your whole body or even your parent’s bodies. To understand how we came to be, we have to understand how we came to exist at all. That is, how the universe came to exist and where it came from.

The questions about the origin of the universe have puzzled us for hundreds of years. That infinite darkness can seem overwhelming and without shape or form. Just a dark void, peppered with the ultra-hot burning ball of gas. Or the sun as we call it.

And the farthest we can even look into this void doesn’t even represent a fraction of its totality. If we just talk about the Milky Way galaxy, there are a billion of these suns neither too close nor too far away from our sun. But, can we really answer where it all came from?

Well, scientists are certainly trying. With the help of modern technologies and centuries of observations, the most convincing theory for the origin of the universe is the big bang theory. It states that the universe began some 13.8 billion years ago with an explosion from an extremely dense and hot point called the big bang singularity. Energy from the big bang created an equal amount of particles called matter and antimatter particles. They are produced in pairs, when they come in contact as they leave pure energy behind. This energy created quarks, the building blocks of protons and neutrons. As time passed, the universe was cool enough for protons and neutrons to be stable, but hot enough for them to fuse. This fusion then produced lots and lots of hydrogen and helium nuclei, and the era is called the big bang nucleosynthesis. This cooling also enabled the electrons to combine with the nuclei and formed the first atoms.

Now, the universe has grown to 600 light-years, and the hydrogen and helium nuclei have begun to collect and form gas clouds. Recent observations suggest that after 150 - 200 million years after the big bang, these clouds of hydrogen and helium clumped together to form huge balls of gas. The high temperature and pressure initiated nuclear reactions in the cores of these gas balls. And then, the first stars were born. The universe was glowing with these spectacular explosions.

Because stars exert an immense amount of gravity, they started collecting in denser regions. This resulted in the formations of galaxies. Observations suggest that galaxy formation started just one billion years after the big bang.

So far, we have seen how hydrogen and helium, the first stars, and the first galaxies were formed. Now, that’s all well and good, but what does that really mean? Is everything just made out of hydrogen and helium? What about your house, your car, or even the air you breathe? Are those just different variations of hydrogen and helium? And where did these heavier elements, like iron, carbon, and oxygen come from? Well, the answer lies in the stars.

Stars, by accident, are giant factories. Most of the mass of a newly born star is composed of hydrogen. This hydrogen fuses to form helium. And since helium is a heavier gas than hydrogen, it then moves inward. Due to very high temperature and pressure, helium then fuses and forms heavier elements. In this way, heavier and heavier elements such as carbon, oxygen, nitrogen, are formed. At some point, a star will have used up all the hydrogen. At this stage, the outer layers of the star will expand, becoming something known as a Red Giant. It is estimated that when our Sun becomes a red giant, in about 5.4 billion years from now, it will swallow Mercury, Venus, and possibly Earth.