What is the Universe?

The word universe is derived from an old French word, Universe, which finds its root in the Latin word universes, which translates to combined into one.

Universe

And that's what the Universe is, everything combined into one mega cosmic system,  

Including all of space, all the matter, energy, time itself, and of course, you and me. 

What exactly is everything in this Universe made of?

But the vital question is,

The Universe is thought to be made of three types of substances, namely, 

5% normal matter

27% dark matter

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and about 68% believed be dark energy.

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Out of these, normal matter consists of atoms that make up stars, meteorites, planets, humans, dogs, and everything else we can see.  But the other vital question is, how did these substances materialize in the first place? 

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Many scientists assumed that the Universe began nearly 13,7 billion years ago with a massive explosion of an extremely hot bubble that was thousands of times smaller than a pinhead. 

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Though it is challenging to know the exact spatial size of the Universe, the observable Universe, which is the ball-shaped region, is estimated to be around 93 billion light years in diameter.

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But a team of scientists at the University of Oxford estimates that our Universe is at least 250 times larger or at least 7 trillion light-years across. 

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Whatever its exact size may be, one thing we surely know is that the Universe's size is continuously expanding since its birth in a phenomenon known as inflation.

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In the 1920s, astronomer Edwin Hubble discovered the Universe was not static.  Instead, it was expanding as the galaxies moved further apart as the space between them grew. So the area of space we now see is billions of times bigger than it was when the Universe was very young. 

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But it is theorized that this expansion might not occur forever as the Universe will eventually stop expanding and start collapsing in on itself, that so-called "Big Crunch."

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But there is still a lot we need to know as our understanding of this subject has constantly evolved with time. However, with ever-advancing technology and knowledge and no shortage of imagination, I'm sure someone from our intelligent audience will reveal many more secrets of the Universe. 

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Did you know that the Milky Way contains at least 100 billion stars, and the observable Universe contains at least 100 billion galaxies

On March 12, 2022, scientists confirmed that more than 5,000 planets exist beyond our solar system. But still, that's just a fraction of the likely hundreds of billions in our galaxy.