The human mind can not possibly understand the real picture about the size of the universe. We not only do not know how large in size, it is also difficult to imagine how big this universe.
If we start from the earth and moving, we'll find out why this is so. Earth is part of the solar system, but it is a very small part. The solar system consists of the sun, the planets around the sun, these asteroids are a very small planets, meteors, etc..
Now, the whole solar system is merely a very small part of another solar system are much larger so-called "galaxy". A galaxy consists of millions of stars, many of which are much larger than our sun, and may have its own solar system.
So, the stars we see in our galaxy, which we call "Milky Way", it is the sun. The stars are so far away so that the distance is measured in light years rather than in miles. Light travels with a speed of approximately 6,000,000,000,000 miles per year. The brightest star and closest to Earth is Alpha Centauri. Do you know how the distance? 25,000,000,000,000 miles!
But we're only talking about our own galaxy. It is said that its width is approximately 100,000 light years. This means 100,000 times 6,000,000,000,000 miles! And our galaxy is only a very small part of a larger solar system!
Most likely there are millions of galaxies beyond the Milky Way. And perhaps a combination of all these galaxies is only part of a larger solar system!
So you know why it is not possible for us to get an idea of the size of the universe. Sometimes the scientists argue that the universe is expanding. This means that every few billion years, these two galaxies will each be two times larger than before!
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