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How Many Stars are in our Vast Universe? ♦ Our Galaxy up to 400 billion

Tuesday, January 9, 2018 4:34
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Universe | On the clear sky on a beautiful autumn night, we will see, with the naked eye, a few thousand stars. But how many stars are present in the whole Universe? About 9,000 stars can be seen with the naked eye if we take into account observations from both hemispheres of the Earth.

With a binocular, we will see about 200,000, and a small telescope will allow us to count up to 15 million stars, while large observers can see a few billion.

But how many stars are they? How many stars are in the Milky Way? According to astronomers, the Milky Way is a spiral of medium-sized galaxies. Our sun is about 27,000 light-years from the galactic core of Orion’s arm.

Astronomers estimate that our galaxy contains up to 400 billion stars different in size and brightness. Some of these are super-gigantic, like Betelgeuse or Rigel. Most stars are of medium sizes, such as the Sun. The vast majority of the stars in the Milky Way galaxy are red dwarf stars.

To go even further with counting stars, we should estimate how many galaxies might exist in the universe. According to astronomers, there are probably more than 170 billion galaxies in the observable Universe, which lie at a distance of 13.8 billion light-years from us in all directions.

To estimate the total number of stars in the observable universe, you can multiply the number of stars in our galaxy by the number of galaxies in the Universe and you will get around 10 ^ 24 stars. I mean one 1 followed by twenty-four zeros. Of course, there might be far more stars than this calculation shows.


Milky Way above Mount Semeru, the highest mountain in East Java, Indonesia standing at 3676m above sea level. What you see here is silhouette of 3 volcanoes, namely Mount Semeru, Mount Bromo and Mount Batok, with red lava smoke spewing from Mount Semeru and the 3 volcanoes surrounded by heavy fog below.

And as most of them have planets that revolve around them, you can multiply the number of stars by 3 or 4 to estimate the number of planets. How many places was life possible? How many places has life developed to the level of very advanced civilizations?

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