There is no end to our curiosity about the vastness of space. In fact, how much do we know about space? In fact, we know very little about space. The size of our solar system is 122 astronomical units or 16300 million kilometers (1 astronomical unit = 150 million kilometers). Now you may think how big is our solar system? In fact, the solar system is less than 1 in 100,000 parts of sand compared to space. Our Milky Way galaxy is about 100,000 light-years across. (The amount of light that travels in a year is called 1 light-year. The speed of light is 300,000 km per second).
Voyager 1 is the longest man-made spacecraft. It is currently 145 astronomical units away from Earth. Or 22 billion km away. Its maximum speed is 61,000 kilometers. And it communicates with us through the Deep Network. At this speed, if the star next to us Proxima Centauri, which is 4.22 light years away from the Earth, it may take 5,000 years to revolve.
The fastest man-made spacecraft to date is the Parker Solar Probe, which can travel at a speed of 692,000 kilometers per hour. Even then, it is very slow compared to light-year speeds. Which may come to the mission by 2030. The age of our space is 14 billion years. The Planck space mission created a perfect design for the oldest light in the universe in 2013. It is about 13.6 billion light-years from Earth.
From this we can infer that the universe is 13.6 billion years old or more. Because of this relationship, we can say that our scientists are able to observe any region 13.7 billion light years away. But this is just a general knowledge of us. Our Milky Way galaxy contains about 400 billion stars. The distance from the center of the Milky Way to our solar system is 25,000 light-years. Where we are struggling to cross a solar system, there are 400 billion solar systems! I just talked about a galaxy. Many galaxies form galaxy clusters. A cluster can contain 12 to 1 thousand galaxies. The size of a galaxy cluster is about 10 million light years.
Our Milky Way galaxy local group is located in the galaxy cluster. Super cluster is another cosmic structure consisting of all those galaxy clusters. The cosmic structure here refers to a single region. The super-cluster that our Milky Way galaxy includes is called Laniakia. Its total extent is about 500 million light-years. At present, the number of super-clusters in our observable universe is about 10.2 million. So if we take the earth as the center, then the total diameter of the universe is about 92 billion light years. But it is estimated. Not being able to see the end of the universe does not mean that we are at the center of the universe. So scientists have tried to measure the extent of the universe in different ways.
We know less than 1 per cent of the universe out of 100 percent. Maybe we can imagine about 2 per cent. And we can't even imagine about the remaining 97 percent. So this is the limit of our knowledge.