UNIVERSE IS EXPANDING: HOW KNOWLEDGEABLE ARE WE?

© Astronomystackexhange.com

The universe is expanding

Our universe is expanding

But how knowledgeable are we regarding this mysterious thing?

Big Bang. Big Crunch. Steady State

Does our universe finite or infinite?

We used to hear those terms—

In our school, in laboratory, or in any scientific settings

But, again, how knowledgeable are we regarding this mysterious thing?

In this poem, let us unravel the mystery

The riddle behind our universe, our mere galaxy

Let us answer important questions in a study called cosmology

Let's begin in question, "how fast is the universe is expanding?"

The rate of expansion of our universe is mostly argued;

of having no precise, no accurate value

But new research does, the "Hubble constant" arise

It is 73 kilometer per second per megaparsec

Today, our universe spans about 96 billion lightyears at stake

Second question, "is the expansion of the universe speeding up?"

When astronomers look at the light

coming from atoms in a distant galaxy sight

They find that its wavelength,

Being stretched, said to be "redshifted"

Think of a wave painted on a balloon

As you get it inflated, then you will surely understand what's going on

Thirdly, "what is the fate of our expanding universe?"

We have these "open", "flat", and "closed" universes

If the universe were open, it would expand forever

If the universe were flat, it would expand forever;

But would later go slow until zero

And if the universe were closed, it will eventually stop expanding;

And the so-called "Big Bang" is anticipating

But thing for sure

Most of scientists assure

Our universe is mere unlikely to adjourn

Fourth question, "what really causes universe expansion?"

It is the "gravity" and the "dark energy" who play

The gravity pulls galaxies closer together

Whilst the dark energy pushes them with another

Last question would be, "is the universe expansion 2D or a 3D?"

Well, look to your left, and then to your right...

Look in front of you, then check behind...

Next look up, and then look down

Congratulations, you just have verified the 3D space

But it is not always be the case

Others would suggest, we have a 2D universe

For them— the flatworlders, it is only the length and width

But for the 3D believers, the height shall be included

For so many theories, ideas, perspectives about universe expansion

Whether it is 2D, 3D, open, closed or flat

Whether our universe will unfortunately end or not

What matter most is now you have the essential grasps

Hope you learned some astonishing facts

About our cherished universe, dearest galaxy and the Earth we loved.

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