It will take 12 billion to 15 billion years for light from the edge of the universe to reach the earth

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35 seconds later, it was 300 million degrees, and the chemical elements began to form

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Which galaxies are closest to the Milky way? The humanoid dwarf is the closest, about 78200 light-years away

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The scientific community thinks that the “Big Bang” of the birth of the universe will happen about..

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We call them extragalactic galaxies

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This is an unimaginable energy explosion

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How far is the earth from the galactic center? The earth is about 25000 light-years away from the galactic center, with an error of 1600 light-years.

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About 14.1 billion years ago, the big bang happened after the singularity, which started the birth history of our universe

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The Milky way is a spiral galaxy with a spiral structure, that is, a silver center and two spiral arms, 4500 light-years apart

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In 1971, British astronomers Linden bell and Martin ness analyzed the infrared observation and other properties of the central region of the Milky way and pointed out that the energy source of the central region of the Milky way should be a black hole, but there is no conclusive evidence for massive black holes

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There are about 80-125 billion galaxies in the universe, with 80 trillion stars

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From the perspective of the evolution of the universe, they are more basic than stars

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Basic knowledge of Astronomy (1) the age of the sun and the earth? It is estimated that the age of the sun is 10 million to 2000 years older than that of the earth

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The universal existence of galaxies shows that they represent a level in the structure of the universe

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There are about 500 stars formed in the last 10 million years, and of course there are thousands of star forming nebulae

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The mass released by the Big Bang is floating in the space, and the huge galaxy composed of many stars is made up of these materials

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Next came the big Magellanic Cloud, 159000 light years away, and the wheat Magellanic Cloud, 189000 light years away

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Now we know that there are 1000 galaxies More than 100 million galaxies, including the famous Andromeda galaxy and Magellanic nebula, are extragalactic galaxies visible to the naked eye

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The middle part of the nucleus ball is called “silver nucleus” and the four sides are called “silver plate”

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In such a vast universe, the earth is just like a drop in the ocean

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There is a larger sphere outside the silver plate, where there are fewer stars and less density, known as the “silver halo”, with a diameter of 70000 light-years

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In other words, if a beam of light is emitted from the galaxy at a speed of 300000 kilometers per second, it will take 13 billion years to reach earth

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The galaxy as a whole has a poor rotation, with the sun on a spiral arm called the Orion Arm, about 25000 light-years from the center of the galaxy

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Originally, people imagined that the universe would not expand because of gravity, but scientists have found that there is a kind of “dark energy” in the universe that can produce a repulsive force to accelerate the expansion of the universe

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It contains one or two hundred billion stars

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0.01 seconds after the big bang, the temperature of the universe is about 100 billion degrees

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From a distance, the galaxy looks like a discus for physical exercise

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There are 100 billion to 200 billion galaxies like the Milky way in the universe

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The rotation speed and period of each part vary with the distance from the silver center

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As for the age of the Milky way, the prevailing view is that the Milky way was born shortly after the big bang of the birth of the universe

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The thickest part in the middle is about 3000-12000 light years

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The sun is about 23000 light-years away from the silver center, and it orbits the silver center at a speed of 250 km / s, with a cycle of 250 million years

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Cosmology holds that the universe we observed, in its early stage of gestation, concentrated on a singularity with extremely small volume, extremely high temperature and extremely high density

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How did the universe come into being? 1

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According to the Big Bang Universe model, the age of the universe is about 20 billion years

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How many galaxies are there in the universe? How many stars are there in each galaxy? In this spherical space with a radius of 13 billion light years, about 125 billion galaxies have been discovered and observed, and each galaxy has tens of billions to trillions of stars like the sun

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What is a galaxy? How many galaxies and stars are there in the universe? Most of the light spots on the sky are stars of the Milky way, but there are also a large number of luminescent bodies which are huge star groups similar to the Milky way

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There are four spiral arms extending symmetrically from the center of the galaxy

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The universe is filled with clouds of gas

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Introduction to the Milky way is the galaxy to which the earth and the sun belong

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If the number of stars in the Milky way is calculated at the lowest level of 200 billion (some people calculate that it is 100 billion), the number of stars in the universe can be calculated as 2 × 1022-4 × 1022, that is, 2 trillion-4 trillion (some people also put forward 80 trillion-500 trillion)

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The diameter of the discus is 100000 light-years, equivalent to 9460800 billion kilometers

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The error is about 10 times

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According to the latest observation data, the farthest galaxy that has been observed is 13 billion light-years

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The center of the galaxy and the four spiral arms are places where stars are concentrated

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Using this method, we can calculate that the age of our Milky way is about 14.5 billion years old, with an error of more than 2 billion years

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Its main part is projected on the celestial sphere, which is called the Milky way in China

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One second after the big bang, it dropped to 10 billion degrees

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The temperature keeps falling and the atoms keep forming

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What is the universe? How big is the universe? What is the age of the universe? The universe is the general name of all things, the unity of time and space

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The main forms of matter are electrons, photons and neutrinos

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According to calculation, the average mass of a star is 0.7 times that of the sun, so 700 billion solar masses means 100 billion stars

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The total mass of all stars in the galaxy tends to be 700 billion solar masses

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By radioactive dating, the age of the earth is 4.5 billion years, so the age of the sun is 4.51 billion years

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How does the Milky way work? How many years does the sun revolve around the Milky way? How old is the Milky way? The Milky way is a giant spiral galaxy, Sb type, with four spiral arms

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So if you do a simple math problem, it’s not hard to know how many stars there are in the universe that we have observed

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The total mass of our galaxy is about 1 trillion times that of our sun, about 10 times that of all the stars in our galaxy

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Some people calculate that there are 500 trillion stars, which is no more than 6 times the actual situation

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How many stars are there in the Milky way? How many times the mass of the Milky way is that of the sun? How many stars are there in the universe? About 90% of the matter in the Milky way is concentrated in stars, and there are gas and dust in the Milky way, which accounts for about 10% of the total mass of the Milky way

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How many stars are born in the Milky way every year? The Milky way has a history of about 12 billion years, during which about 700 billion stars have been formed, that is, the annual rate of star birth is more than 50

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The protruding part in the middle of the oblate sphere is called the “nuclear sphere”, with a radius of about 7000 light-years

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14 seconds after the big bang, the temperature was about 3 billion degrees

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Scientists believe that it originated from an incredible big bang 13.7 billion years ago

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In history, they were mistakenly regarded as nebulae

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Our sun is one of these countless stars

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In the Milky way, most of the stars are concentrated in a flat sphere, which is shaped like a discus

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Under the action of gravity, they formed a stellar system, which has evolved into the universe today

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After that, the matter diffuses rapidly and the temperature decreases rapidly

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