- How many stars are in the Milky Way
- Galaxy’s environment
- Structure and formation of Milky Way
The Milky Way is a type of spiral galaxy within which our solar system exists. When you look up at the sky at night, you see a bright white light which is the Milky Way. Due to the presence of many stars, it appears so bright and white. The stars found in the Milky Way are several billion years older than our Sun.
It is in the shape of a large whirlpool, which spins once in 200 million years. It is so big that it will take 100,000 years for it to travel from one end to the other. The galactic center is present in its medium. Due to the dense gas and dust clouds there, it is very difficult to see it. For this reason it has also been difficult to see the other side of its center.
How many stars are in the Milky Way
It is estimated that there are at least i.e 100 billion stars in the Milky Way, but it is possible that this number ranges from 400 to 500 billion. For comparison, our neighboring galaxy, Andromeda, could be 1 trillion stars.
Our Galaxy is like a bloated circular puri in the middle. In this there are all those stars within a circle which we see separately in the sky. Stars and star clusters are sparsely distributed around our Galaxy.
The stars are more dense in number near the center of our Galaxy and are relatively scattered towards the edge. All the stars are revolving around the centre, the stars nearer to the center at greater speed and the farthest at lesser speed. Our Sun is about 30-35 thousand light-years away from the center and is in the middle plane of the Galaxy.
For this reason, our galaxy appears to us like a mekhela which has been described above. The center of the Galaxy from Earth is towards the constellation Sagittarius. That’s why it orbits the center of the galaxy. Its velocity in this orbit is 150 miles per second. Even with this velocity, it takes 200 million years for the Sun to complete its revolution.
Some fast-moving stars and globular clusters are outside the boundary of our Galaxy, but they are also associated with and considered part of our Galaxy; about 100 spherical clusters are known. Their distribution is circular.
The center of the Galaxy can be known from the distribution of these clusters. Measuring the speed of stars also helps in calculating the center. In form and detail, galaxies resemble many extragalactic nebulae (that is, those galaxies that are completely outside our Galaxy).
Structure and formation of Milky Way
When you look at the sky at night, you can see a broad white stripe, which is the Milky Way. These bands have been visible ever since.
Earth has been created. The part of the Milky Way that we can see from Earth is considered to be its outer part. The Milky Way is surrounded by a halo of hot gases that spans several thousand million light years and keeps on rotating. It spans 100,000 light years.
It has two arms and two spurs. One of these spurs is named Orion spur, inside which our Sun sits. The names of both the arms of the Milky Way are Perseous and Saggitrus. This galaxy of ours keeps on expanding or expanding. In the middle of it is a black hole named Sagittarius A*.
The curved arm around the Galaxy is made up of clouds of dense gas and dust. New stars are always being formed in this arm. All these are being formed inside a circular disc. They are equal to 1000 light years.
The central part of the Milky Way is very protruding and, as mentioned earlier, this part is filled with dense gas and dust clouds – so we do not know at the moment what lies on the other side of it.
This protruding part is also inhabited by dark holes, which are several billion times more massive than the Sun. Its formation started due to a small point, which grew further through the dense clouds and their form became fierce. Some studies have shown that the mass of the Milky Way is 400 billion to 780 billion more than the Sun.
[How many stars are in the Milky Way | Galaxy’s environment]