Welcome to our new post! Get ready to learn amazing things about galaxies and impress your friends with these interesting facts.
Galaxies are formed by planets, stars, and clouds of dust and gas.
The largest known galaxy is located approximately 1 million light-years from ours and contains trillions of stars. Even the smallest galaxy contains around a few thousand stars and is a few hundred light-years away.
At the center of most large galaxies, there is a supermassive black hole. And now you might be wondering, how big is a supermassive black hole? It exceeds the mass of our Sun by several trillion times!
The shape of a galaxy can be spiral, irregular, or elliptical. It is believed that the newest galaxy formed around 500 million years ago. The vast majority of galaxies formed between 10 and 13.6 billion years ago.
Milky Way
Our galaxy is the Milky Way and has a spiral shape. Its age is approximately 13.2 billion years. Did you know that the Milky Way takes 200 million years to complete one rotation?
In our galaxy, there are between 200,000 and 400,000 million stars. The Sun is located approximately 28,000 light-years from the center of the Milky Way in the Orion Arm.
It is believed that in approximately 4 billion years, there will be a collision between our galaxy and Andromeda (a nearby galaxy larger than ours). Would our solar system be destroyed by this collision? The Sun would remain intact, but it would be thrown out of the new galaxy along with our entire solar system.
Andromeda
In this galaxy also known as M31, 26 black holes were found. By studying the Andromeda galaxy, it was discovered that a galaxy can have two nucleus. These nucleus move with respect to each other, and one of the nucleus is decomposing the other.
Dark matter
Have you ever wondered what the difference is between dark matter and normal matter? Normal matter is composed mostly of protons, neutrons, and electrons. Unlike dark matter, this matter reflects visible light, ultraviolet light, or infrared light. Dark matter does not absorb, reflect, or emit light, or at least if it does, it cannot be identified with the current technology we have. It is still unknown which particles make up dark matter.
It is thought that dark matter is part of a network interconnected throughout the universe. It is known that it is not composed of the particles we know, because if it were, it would behave differently.
Dark energy
It is estimated that dark energy makes up about 68% of the universe. Not much is known yet about this type of energy, but something like this is needed to explain the acceleration of the universe. This acceleration has a repulsive effect on the gravitational effect, causing the universe to expand opposing the "contraction" effect of gravity.
📚 Data source:
https://science.nasa.gov/universe/galaxies/
https://www.muyinteresante.com/ciencia/1899.html
https://www.ngenespanol.com/fotografia/via-lactea-y-andromeda/
https://science.nasa.gov/universe/overview/building-blocks#hds-sidebar-nav-3
https://www.nasa.gov/missions/chandra/andromeda-galaxy-vibaj/
https://en.wikipedia.org/wiki/Andromeda_Galaxy
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