How Big is Our Universe?

In this modern age of the twenty-first century, do we know exactly how big this universe is? Where is the end of it? If you are asked what is the size of the table you are reading on or the size of the house you are staying in, you can easily measure it. But when the same question arises about the universe, it becomes very difficult to imagine.

By calculation, scientists have told us that our earth is about 40,000 kilometers long along the middle. But the world that seems so big in our eyes, how much is that world compared to this universe?

Let's start this calculation from our nearest planet Moon. The moon looks much bigger to our eyes and may seem much closer to Earth. But in reality the moon is about three lakh eighty four thousand four hundred and sixty seven kilometers away from us.

Thirty more worlds could easily be left in the space between the two if we imagine. Even if you travel to the moon at a speed of one hundred kilometers per hour, it will take about 160 days to reach the moon. So far, only 12 people have had the honor of setting foot on the moon.

From the moon our earth looks a bit like that. Again if you look at our earth from Mars or Mercury it will look like a small dot. The distance to Mars is about 225 million kilometers from our Earth on average. This distance is so great that it would take about 20 minutes for light from Mars to reach our Earth. That is, it is never possible to maintain instantaneous communication from Mars to Earth.

The man-made spacecraft Voyager-1 has traveled the longest distance in space so far. Its current distance from Earth is 141 A.U (astronomical unit). 1 The astronomical unit is the distance of the sun from the earth. Then you understand that Voyager-1 is now about 141 times farther from the Earth than the Sun.

A picture of the Earth was taken from Voyager 1 on this long journey. The white dot that can be seen in the picture above is our world. This is the place where you and I all live. Voyager 1 is now running at a speed of 17 kilometers per second in the chest of space.

If Voyager 1 continues to travel in space at this speed, our galaxy Milky Way will not be able to surpass it even after 33,000 years. If our solar system can be zoomed out then we get interstellar. The astronomical unit becomes much smaller to measure this distance. So here the distance is calculated by calculating the light year. 1 light year means that light travels as far as it can from the earth in one year. After the Sun, the closest star to our Earth is Proxima Centa. Which is about 4.24 light-years from Earth. It would take about 70,000 years for Voyager 1 to get there at its current speed.

If we zoom out more then our Milky Way galaxy can be seen. And one of the little dots in this area is our world. Just think, our world is as small as a tiny grain compared to this Milky Way. It will take us about a million light years to travel from one corner of this galaxy to another. And our galaxy is filled with about 10 trillion planets and stars.

আপনার এখন মনে হতেই পারে এই গ্যালাক্সি বিশাল বড়। কিন্তু থামুন, মহাবিশ্বের তুলনায় আমাদের গ্যালাক্সি কিছুই না। যদি এই মিল্কিওয়েকে জুম আউট করা যায় তাহলে আমরা দেখতে পাবো লোকাল গ্রুপ অফ গ্যালাক্সি। যেখানে মিল্কিওয়ের মত প্রায় 54 টি গ্যালাক্সি আছে। এটা এতই বড় যে এর এক কোনা থেকে আরেক কোনায় দূরত্ব হলো প্রায় 10 মিলিয়ন আলোকবর্ষ।

And if we zoom it out further, we find the Vargo Super Cluster. Of which this local group of galaxies is a very small part. There are at least 100 local groups of galaxies. Its distance from one corner to the other is 110 million light years. But the universe is much bigger than that.

If the Vargo super cluster is also zoomed out, then we get the Lenicia super cluster. Its distance is so great that the distance from one corner to the other is about 520 million light years.

If the Lenicia super cluster is also zoomed out, it will also feel like a tiny part. Because then we will see the observable universe. But that doesn't mean the universe ends here. In fact, it is just as far as people have come so far.

It could be that the whole universe is thousands of times bigger than that. We must not forget that the center of this observable universe is our earth. If we put our earth in the middle, the distance of the observable universe is 4650 crore light years.

And so far as we have said, everything is within this observable universe. Now a question may come, is this the universe? In fact, this universe is of two kinds. One is the observable universe as far as we have seen. And the second is the whole universe which we have not had the good fortune to know about.

For example, if you look at the earth from a tall tower in the middle of the earth, only a part can be seen. The tower can be said to be the center of only a small part. And for that part, this is the observable universe.

And what he is not seeing does not mean that he is not a part of it, that is, the part of the world that the man sitting on top of that tower cannot see is a non-observable universe. And this universe of observable and non-observable universes is still a mystery.

Also according to the Cosmic Influence Theory the whole universe is 150 sextillion times larger than our Observable Universe. Our Earth is just as big as this Observable Universe, just as much as a virus is bigger than our Milky Way.

But we must not forget that this observable universe is getting bigger day by day and it will get bigger with time. Our vision will move farther and farther across space to know the unknown, to know the unknown.