Earth is surrounded by the mystery of our abode. Which is a small planet in the solar system. Its area is about 51 crore square kilometers. Does it seem that our earth is much bigger? In fact, it is not so. If we look at the universe, this huge volume of our earth is equal to a dust particle. Now it may seem that this galaxy is actually? A galaxy is a combination of gas, dust, billions of stars and their planets, asteroid dark matter. Which are bound to each other in a certain way by the force of gravity.
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Depending on the size and structure of a galaxy, there could be hundreds of billions of stars. The Sun is the abode of the Earth and other planets. Similarly, galaxies are the habitats of the stars. The planets revolve endlessly around the sun. The stars are constantly spinning in their own orbits in the galaxy. The Milky Way galaxy is one such galaxy. And our sun is one of the stars in this galaxy. The location of our solar system is about 27,000 light-years away from the center of this galaxy. The Milky Way galaxy we live in has a diameter of 90,000 light-years.
Now the question that may come to mind is what is the light-year? We know the speed of light is 3 lakh kilometers per second. The amount of light that travels in a year is called one light-year. Then you can understand how huge this galaxy is. Innumerable stars can be seen when looking at the cloudless sky on a moonless dark night. On such a dark night, if they look at the inlaid sky, they will see that a thin vague stream of light has gone from one horizon to the other through the sky. This is our galaxy. Galaxies can be many shapes. Among them are elliptical, spiral, coiled, or irregular.
This difference is thought to be due to the fact that two to three billion years after the creation of the universe, most of the galaxies formed at the same time. The hydrogen and helium clouds that formed in the first three minutes of the creation of the universe are now the building blocks of galaxies. Scientists believe that the Milky Way galaxy contains a powerful black hole at the very center. How old is our Milky Way galaxy? Determining the age of the Milky Way galaxy is an extremely difficult task. The oldest star in the Milky Way galaxy is HE15230901. Which is about 13.2 billion years old. Which is almost equal to the age of the universe. The Milky Way galaxy is thought to have been formed about 6 to 10 billion years ago.
Scientists estimate that in the next 4 billion years there could be a catastrophic collision between our Milky Way galaxy and the neighboring galaxy Andromeda. The galaxy is moving towards our Milky Way galaxy at a speed of 250,000 miles per hour. Our sun is much smaller than the billions of stars in our Milky Way. We even have stars in our galaxy that are as small as the Sun's mustard seeds. This sun is 13 million times bigger than the earth. Now think about where you are. How much of the universe are you wandering around? The information that has been found so far about the Milky Way galaxy is thought to be very little. Because we still have a lot to learn about the Milky Way galaxy.