Space has been a mystery to us for ages. People would get lost in the night sky and a lot of thoughts would be created in people's minds. Since then, as people have progressed, more and more mysteries have been revealed about this space. Gradually people discovered the telescope, after which the human race found a new direction. Through which we can see what is billions of light years away.
Just as a solar system is formed with a few planets, a galaxy is formed with a few thousand stars and a galaxy cluster is formed with thousands of galaxies. This is how our space system was created. But this was not the case 100 years ago today. 100 years ago, people only knew about our milky way galaxy to say galaxy, people thought that everything we see in this milkyway galaxy means everything in our space is a part of this milkyway galaxy.
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| Nebula |
But in the 17th century, Charles Messier who discovered 40 nebulas in his lifetime.
The formation of a star requires more dust particles than gas, known as nebula, and the nebula is found only in galaxies.
When he sees, he sees untouchable bright things. Which in no way can be a nebula.
Later many scientists said that these are the island universe which is a universe like our milky way galaxy, but many scientists disagreed with this decision and said that they are actually a part of our milky way galaxy. This debate ended in the 1920s. When the famous American scientist Hubble was researching the Messier-31 nebula which is now the Messier-31 galaxy, he determined the distance of Messier-31 from us with the help of LMC method and this debate ended. Like our galaxy, there are thousands of stars in that galaxy.
A galaxy is a gravity system made up of thousands of stars, nebula, dark matter, and dust particles. We all know that every galaxy has a huge black hole.
Thus began the search for the galaxy. We have thousands of galaxies in space, so in the next (1932) Hubble galaxy broke down several types. Hubble classifies this class based on the shape of the galaxy.
● Elliptical: -
Basically, these galaxies have less dust and nebula, and the size of these galaxies is comparatively less. These galaxies rotate around the center. These galaxies are elliptical in shape, so they are called elliptical galaxies. One of the elliptical galaxies is NGC-1316.
●Spiral: -
Basically, the size of such galaxies is comparatively large. They are formed in such a way that they look like spirals, so all these galaxies are called spiral galaxies. And the rest of the stars revolve around the center of such galaxies. And such galaxies have huge black holes in between. welshpool is the first spiral galaxy we have discovered.
The largest spiral galaxy is the Dubbed UGC 2885, or LEDA 14030, the spiral galaxy is 8,16,000 light-years wide - roughly 8 times the size of the Milky Way Galaxy.
● Lenticular: -
Such galaxies are spiral and elliptical. These galaxies, like spiral and elliptical galaxies, also have flat discs.
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| Lenticular galaxy |
● Irregular: -
These galaxies have no specific shape, so they are called irregular galaxies.
The largest galaxy is the IC 1101 which is 100,000 light years away which is 2000 times larger than our Milky Way galaxy.
This is the elliptical galaxy.
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