When will the second galaxy of mankind be discovered

The word galaxy itself is not clear, I wonder if you are referring to a star system like the Sun, or a river system like the Milky Way?

Either way, though, it's still out of reach for humanity today.

So far, the farthest planet that mankind has reached (manned spaceflight) is nothing but the Moon, and the Moon, in a practical sense, cannot be regarded as leaving the Earth--- because the Moon is a satellite of the Earth and is part of the Earth's orbit, and if it does not leave the Earth's orbit, it is not really out of the Earth.

In other words, if humans do not walk around the solar system--- let alone move around at will, they can't even do it, how can they have the ability to think about another galaxy?

As for the river system, it is even more distant. Even if human beings go out of the solar system and can explore within the galaxy, there is still an unreachable distance from leaving the galaxy.

As for discovery, I think your definition should be to find another planet with terrestrial life, right?

Planets are so small compared to stars. Human astronomical telescopes have found some signs of planets outside the sun, but without exception, these planets that can be observed are giant gas planets similar to Jupiter and Saturn. Solid terrestrial planets such as Earth, Venus, and Mars have not been observed so far.

The general view in the astronomical community is that the number of terrestrial planets will not be small, and the reason why they cannot be observed is that the means of human observation have not yet reached that level. The reason is very simple, in the vicinity of the second generation of stars, there must be a large number of heavy elements, and it is inevitable that these heavy elements will coalesce into terrestrial planets. It's just that due to the gravitational effect, most of the terrestrial planets of heavy elements are too close to the stars, and the dazzling light of the stars affects human observation, and the existence of terrestrial planets has not been confirmed so far.

And the planet of life suitable for the survival of human beings on the earth, it can be determined that there must be a large number of people in the Milky Way, very simply, the emergence of intelligent life (humans) is full of accidents, but the emergence of life is definitely not accidental.

Now it's still a question of whether it can fly out of the galaxy, and even if it does, what if?

In the 90s of the last century, NASA in order to better honor Edwin. Hubble's outstanding contribution to astronomy deliberately named the space telescope of the old and new gods in order to better "Hubble glasses", so far Hubble glasses have seen hundreds of billions of extragalactic galaxies in the observable universe, and scientists feel that there are at least one trillion planets in the wider unobserved universe。In the observable universe with an aperture of 93 billion light-years, the largest galaxy found to be the "super-maximum elliptical galaxy IC 1101" at the core of the Albert 2029 galaxy cluster 100 million light-years away, has a staggering 3 million light-years of half-longitude, compared to the Milky Way's diameter of only 200,000 light-years.

Planet is a celestial system composed of many planets and interstellar empires, which are almost innumerable in the Milky Way, in fact, in the early stage, everyone did not know that there were so many planets in the universe where everyone was located, and they always thought that the solar system was owned by all the earth. It wasn't until later that a scientist in the United Kingdom, Edwin Hubble, when observing the distant Andromeda Nebula, found that the Andromeda Nebula was actually very long apart, and its aperture was larger than the diameter of the Milky Way, so it was confirmed that the Andromeda Nebula was a separate planet system software.

It was only later that everyone realized that there were other planets outside the solar system. Nowadays, with the continuous development of astronomical observations, we all know that the solar system is a planet with a diameter of about 12-160,000 light years, and the total number of planets in it is about 200 billion or more.

It is now known that the largest galaxy is located in the Abelian Constellation located 100 million light-years away, which was discovered by the American scientist Sbury Herschel in 1790, and then included in the database index catalog by Emil Dreyer, becoming the 1101st star, so this planet was named IC-1101. According to the scientific research of scientists, IC 1101 is often so large that it may be composed of many planets, because it happens to be produced in the core of the planet group, so under the effect of attraction, it continues to collide with the surrounding planets, and finally develops and grows step by step, before it becomes the appearance that everyone sees today.

Five galaxies have been discovered, the largest of which is the Solar System, which contains the Earth and planets. Like the moon.

So far, 10,000 billion galaxies have been discovered; According to scientists, the largest galaxy IC1101 is a veritable giant, with a diameter of 6 million light-years, nearly 30 60 times larger than the Milky Way, and according to statistics, it will contain tens of trillions or even hundreds of trillions of stars inside.

So far, 2,000 billion galaxies have been discovered in the universe; The largest galaxy ever discovered is the Abelian Group.

25,000 galaxies have been discovered, and the largest, IC12011, is more than 70 light-years long.

The time when the nine planets were discovered by mankind were:

1. Mercury: As early as 3000 BC in the Sumerian era, people discovered Mercury, and the ancient Greeks gave it two names: when it first appeared in the early morning, it was called Apollo, and when it twinkled in the night sky, it was called Hermes.

2. Venus: Venus has been known since prehistory. Aside from the Sun and Moon, it is the brightest one. Just like Mercury, it is often thought to be made up of two separate stars, the morning star is called eosphorus and the evening star is called hesperus.

3. Earth: Earth is the only name that is not derived from Greek or Roman mythology. The word earth comes from Old English and Germanic languages. It wasn't until the time of Copernicus in the 16th century that people understood that the Earth was just a planet.

4. Mars: Mars has been known to mankind since prehistoric times. Since it is considered to be the best dwelling place for humans in the solar system, it is loved by science fiction writers.

5. Jupiter: Jupiter is the fourth brightest object in the sky, and Jupiter has been known to mankind since prehistoric times.

6. Saturn: Saturn was discovered in prehistory. Galileo Galilei first observed it through a telescope in 1610 and recorded its strange trajectory.

7. Uranus:

Uranus was systematically searched by William Herschel through a telescope and discovered on March 13, 1781, and was the first planet discovered in modern times.

8. Neptune:

When Neptune was discovered in 1848, there were some difficulties. Some mistakes were made at first, but in 1612 Galileo observed the planet and judged it to be a moon of Jupiter.

9. Pluto:

Pluto was discovered in 1930 by American astronomer Clyde Tombaugh. It was previously classified as a planet because it was initially mistaken for being about Earth's size.

On August 24, 2006, at the General Meeting of the International Federation of Astronomical Literature, 2,500 delegates voted to approve a new DAO definition of planets, which no longer treats Pluto, one of the traditional nine planets, as a planet, and includes it as a "dwarf planet". This means that there are only eight planets in the solar system, and astronomy textbooks around the world will be revised.

Timeline of the eight major planetary discoveries.

1.Mercury: The second asteroid in the solar system, discovered by the Sumerians around the third millennium BC.

2.Venus: It has been discovered before the history of mankind.

3.Earth. 4.Mars: The red planet, discovered by astrologers in prehistoric times.

5.Jupiter: The largest planet in the solar system, discovered since ancient times.

6.Saturn: The planet orbited by the "rings", the second largest planet in the solar system, Galileo discovered Saturn's rings in 1610.

7.Uranus: The third largest planet in the solar system, discovered by John Flamantide in 1690.

8.Neptune: The fourth largest planet in the solar system, Galileo was discovered on December 28, 1612.

Pluto is a dwarf planet discovered by Clyde Tombolo on February 18, 1930.

The planets of the solar system, in descending order of distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, but in Resolution 5 adopted at the 26th International Astronomical Union held in Prague on August 24, 2006, Pluto was classified as a dwarf planet and removed from the nine planets of the solar system, so it is now eight planets.

Mercury, Venus, Earth, Mars, Jupiter, and Saturn were discovered in the early days of mankind, and Uranus was systematically searched by William Herschel through a telescope and discovered on March 13, 1781, and it was the first planet discovered in modern times, galle and d'Arrest first observed Neptune on September 23, 1846, and Pluto was discovered in 1930 by American astronomer Clyde Tombaugh.

In the Sumerian civilization excavated in archaeology in the 70s of the last century, the Sumerians had already observed nine planets more than 6,000 years ago. including the moon, the sun; And planetary clouds!

According to Popular Science, British scientists say that with the help of new data provided by the Hubble Space Telescope, they have found at least 2 trillion galaxies in the universe through calculations. Scientists previously estimated that there were only 100 billion to 200 billion galaxies, but the new conclusion is more than 10 times the number previously known, and many of them are so "small", weak, and so far away that no trace of them has been found.

Christopher Conselice, an astrophysicist at the University of Nottingham and a collaborator on the new study, said in a statement: "It's incredible that more than 90% of the galaxies in the universe have yet to be studied. In an interview with Popular Science, Conselicher said that last year, they devised a formula to explain the distribution of galaxies according to their size.

They believe that very large galaxies are very rare; The number of "small" galaxies is huge; Whereas, the number of medium galaxies is in the middle.

By analyzing the number of faint galaxies that can be seen by the Hubble Space Telescope, the Konselicher team determined that there may be a staggering number of galaxies that are currently invisible. The team also estimates that the number of galaxies in the universe is at least 10 times higher than previously thought.

When the universe was just a billion-year-old "baby," Conselicher explained, these galaxies could have clustered together about 10 times as close as we see them today, slowly drifting apart over time, and many galaxies could have been swallowed up by larger galaxies. Most of the galaxies we can see now with space telescopes are large, bright galaxies, which are also rare.

The James Webb Space Telescope, which will be launched in 2018, is expected to uncover a large number of previously undiscovered galaxies, which may shed some light on how galaxies formed and how they evolved.

There are at least two trillion galaxies in the universe, and this is only currently detectable, so the universe is huge. Galaxies are generally composed of a large number of stars and nebulae, which can be divided into spiral galaxies, barred spiral galaxies, elliptical galaxies and irregular galaxies according to their shapes, but in fact, most galaxies are composed of nebulae and star clusters.

There are at least two trillion galaxies in the universe.

There are at least two trillion galaxies in the universe, and this is just the tip of the iceberg that people have observed in the universe, and there are actually many more galaxies. Galaxies, also known as extragalactic galaxies, are generally made up of a large number of stars and nebulae, but in fact each galaxy is very far apart.

Generally, according to the shape and structure of galaxies, galaxies can be divided into spiral galaxies, barred spiral galaxies, elliptical galaxies and irregular galaxies, and different galaxies have many different shapes. At present, the most common classification of extragalactic galaxies was proposed in 1929 and has made great contributions to the exploration of galaxies.

Galaxies typically contain stars, gas, cosmic dust, and dark matter, all of which are bound together by gravity to form nebulae. Galaxies are generally very large, but with the exception of individual stars and thin interstellar matter, most of the remaining galaxies are composed of nebulae and star clusters.