How many planets are there in the universe, and how many planets are there in the universe?

At the International Astronomical Union Congress held in Sydney on the 22nd, Australian astronomers said that there are about 700 trillion stars in the entire visible universe, that is, 1022 stars.

Even in the darkest part of the earth, only about 5,000 stars, including stars and some planets in the solar system, can be seen when looking at the sky with the naked eye, and only about 100 stars can be seen in brightly lit cities.

Using astronomical telescopes, Australian astronomers first select a small area of the universe for observation, measure the brightness of all galaxies in that area, and calculate the number of stars contained in all galaxies, and then use the results to extrapolate the number of stars in the entire visible universe. Astronomers believe that this figure is much more accurate than previous estimates.

The number of stars reported by Australian astronomers at the International Joint Astronomical Congress in Sydney can indeed be called astronomical. 700 trillion stars is the addition of 22 zeros to the number 7. That's more than all the grains of sand in the sands and deserts of the planet.

Dr Dryford of the Australian National University said: "The actual number of stars in the universe may be even larger than that, and may even be uncountable. He believes that many stars in the universe have planets, and that some of them may have life on them.

But because they are so far away from Earth, humans may never be able to have any contact with the creatures that live there.

The Sun is only one of about 300 billion stars in the Milky Way. Astronomers believe that the Milky Way galaxy has about 93 stars with planetary systems, or 280 billion stars. And the entire universe has 200 billion to 300 billion galaxies similar to our Milky Way.

Due to the large differences in the proportion of planets present between galaxies, the exact extent cannot be estimated.

Landlord, I can only tell you that on Earth you often see with the naked eye there are Venus, Jupiter, Mars.

Countless. With the current level of human science and technology, it is impossible to calculate.

The age of man will certainly not find the answer.

There are 125 billion galaxies in the universe, the universe is vast, its galaxies are innumerable, it is difficult to count clearly, and we have observed 125 billion galaxies, and the stars in each galaxy include hundreds or even trillions, and there are great differences between different galaxies.

Galaxies are made up of a large number of stars and interstellar dust, which are the basic units of the universe, and different galaxies have different types that can be aggregated and combined into superclusters. The solar system is our galaxy, which is formed by the gravitational confinement of the sun and also includes many celestial bodies inside.

Galaxies, also known as extragalactic galaxies, are galaxies made up of a large number of stars outside the Milky Way, so far away that they appear to us as vague points of light. Extragalactic galaxies and galaxies are also composed of a large number of star clusters, nebulae, and interstellar matter, and about 1 billion galaxies similar to the Milky Way have been observed.

The universe is vast, people have had many fantasies about the universe since ancient times, and with the development of aerospace technology and observation technology, the more human beings know about the universe, the greater the scope of understanding, and now human beings are even difficult to touch the boundary of the Milky Way, but for the universe, there are countless star coefficients like the Milky Way, so our exploration of the galaxy continues.

No one is concerned with this question, but there are eight planets known in the solar system.

At least one or two hundred billion planets.

1. Mercury

Because of its rapid movement, it was called Mercury in ancient Europe, which means the messenger god of ancient Roman mythology. In ancient China, it was called Chenxing, and Sima Qian, the author of the Western Han Dynasty's "Historical Records of Tianguanshu", found that Chenxing was gray from actual observation, which was associated with the Five Elements Doctrine, and named it Mercury with black water.

2. Venus

Among the eight planets in the solar system, it is the second planet from the sun outward, with an orbital period of heaven, and no natural satellites. Venus was called Taibai, Xingxing or Da Huan in ancient China, and its appearance in the east in the morning was called Qiming, and its appearance in the west in the evening was called Chang Gung.

3. Mars

It is the fourth closest planet to the Sun and the second smallest planet in the solar system after Mercury, and is one of the four terrestrial planets in the solar system.

4. Jupiter

It is the fifth-closest planet to the Sun and the largest planet in the solar system, with 79 known moons as of 2019.

5. Saturn

It is one of the eight planets in the solar system, and the distance to the sun ranks sixth in the solar system. Ancient Chinese Saturn was named by the ancient Chinese based on the Five Elements Doctrine combined with the color (yellow) of Saturn as observed by the naked eye.

Summary. Pro, according to reliable data, the Milky Way is 200 billion to 400 billion stars.

How many planets are there in the universe?

Pro, according to reliable data, the Milky Way is 200 billion to 400 billion stars.

There are 8 known planets in the solar system. They are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

How many planets are there in the universe?

There are more than 200 billion stars in the Milky Way galaxy alone, and there are hundreds of billions of galaxies in the universe, and the number of planets per star is indefinite (the sun is 8), so it is difficult to accurately calculate the number of stars, but its number is certainly large, there is no doubt about it!

The universe is finite and unbounded, so the number of planets is theoretically limited, but we will never know the specific number. Keep it and you'll be blind!

To answer the question of how many planets there are in the universe, we can only use a statistical point of view. From the current observation, there are about 200 billion galaxies in the universe, each galaxy has an average of about 200 billion stars or nebulae, there are about 200 billion stars in each star, there are about 100 or so large planets, dwarf planets, so that the number of observable planets in the universe is roughly 5 10 24, of course, this does not include asteroids or wandering planets, etc., of course, with the current level of human exploration, it is impossible to achieve completely accurate measurements.

Countless planets, but close to the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, etc

This is an astronomical number, or even an astronomical number that does not make sense, the universe has 1000 to 200 billion galaxies like ours, and each such galaxy has a minimum of 200 billion stars, so a rough estimate, the number of stars in the universe alone is 2 1022 4 1022, that is, 20 trillion 40 trillion billion, then there are as few as one or two planets around the star, and as many as dozens of planets, what an exaggerated number... Add to this the fact that stars are dying out and new stars are being created, so the same is true of planets, which is a variable, and a variable that can never be counted only by the universe itself, in short, this number is meaningless, and we can hardly express it mathematically.

The 8 majors, namely Venus, Saturn, Jupiter, Mercury, Earth, Mars, Uranus, and Neptune, Pluto are no longer classic planets.

The General Assembly of the International Astronomical Union voted on Resolution 5, partially adopting a new definition of planets, with Pluto being excluded from the list of planets and being included as a "dwarf planet".

The International Astronomical Union (IAU) relinquished the idea that the eight planets of the solar system other than Pluto were "classical planets", thus confirming that there were only eight planets in the solar system and that Pluto had been downgraded to a "dwarf planet". The first plan that was previously rumored proposed that the solar system would be aborted with plans to add three more second-order planets.

For decades, scientists generally believed that there were nine planets in the solar system, but with the discovery of an object larger and farther away than Pluto, the debate over Pluto's status as a large planet has intensified. One is because the process of its discovery is based on a false theory; The second is that because of the wrong estimation of its mass, it was mistakenly included in the ranks of large planets. Therefore, at the Congress of the International Astronomical Union, whether to "correct the name" of Pluto has become the focus of the conference, for which astronomers have given various proposals.

In 1930, the American astronomer Tombo discovered Pluto, and at that time misestimated the mass of Pluto, thinking that Pluto was larger than the earth, so he named it a large planet. However, after nearly 30 years of further observation, it was found that its diameter was only 2,300 kilometers, which was smaller than that of the Moon.

Pluto is currently the farthest planet in the solar system and has the flattest orbit. Pluto's mass is much smaller than that of other planets, and even in the moon world it can only be ranked first.

Seventh or eighth place. Pluto's surface temperature is so low that the vast majority of the matter on it can only be solid or liquid. Downgraded Pluto to a dwarf planet, and added Ceres, Charon, and Xena 2003UB313 as dwarf planets.

You may have seen that there are at least 100 billion to 200 billion planets in the Milky Way, which is not an estimate of the number of planets, but a lower limit of the number, on the contrary, if we were to make a preliminary estimate, we would get an order of magnitude higher, which is almost 10 trillion planets in the Milky Way!

There are about 700 trillion trillion planets, or 1,022 planets, in the entire visible universe.

There are about 700 trillion stars in the entire visible universe, but this is limited to the visible universe. But the extent of the universe that we can observe is not known.