What are the galaxies around the Sun and what planets are there in the Solar System?

It should be a lot! Due to the limited exploration of space by humans! There is a range of about 1 million light years!!

On a clear night with no light interference, if the sky is dark enough, you can see a diffuse band of light in the sky. This band of light is the star-covered round surface of the Milky Way, the silver disk, that we see when we look at the Milky Way from within. There are more than 200 billion stars in the Milky Way, but they are too far away to be identified by the naked eye.

Since the starlight is mixed with interstellar dust gas, it looks like a smoke-shrouded band of light. The center of the Milky Way is located near the constellation Sagittarius.

The Milky Way is a medium-sized star system with a silver disk about 120,000 light-years in diameter. Its silver disk contains a large number of interstellar dust and gas clouds, which aggregate into reddish star-forming regions, thus constantly replenishing the spiral arms of galaxies with hot young blue stars, forming many open star clusters or galactic clusters. There are more than 1,200 known such open clusters.

The galactic disk is surrounded by a large galactic halo interspersed with stars and globular clusters composed mainly of older stars.

Swan-Sagittarius direction of the Milky Way.

Brilliant galactic center (silver core) section.

The Brilliant Center of the Galaxy (Silver Core) Part II.

Vega, Altair-Sagittarius direction of the Milky Way.

Milky Way in the direction of Aquila-Sagittarius.

Long shield - Milky Way in the direction of Sagittarius.

It's hard to know exactly what shape the Milky Way is from the perspective we're in. However, with the development of modern science and technology, advances in detection methods have overcome these obstacles to some extent, revealing some unexpected features of the Milky Way. It has long been thought that the Milky Way is a typical spiral galaxy, similar to the Andromeda Galaxy.

However, recent observations have found that its **nuclear sphere is slightly rod-shaped. This means that the Milky Way is most likely a barred spiral galaxy. In addition, the Milky Way is a relatively active galaxy with strong cosmic ray radiation from the silver core, where stars rotate at high speed around an invisible center.

This suggests that there is a supermassive black hole at the core of the Milky Way.

The Milky Way has two smaller neighbors, the Large Magellanic Cloud and the Small Magellanic Cloud, both of which are irregular galaxies. Due to gravity, the Milky Way is constantly sucking dust and gas from these two small galaxies, leaving less and less material in these two neighbors. It is expected that in 10 billion years, the Milky Way will engulf all the material in these two galaxies, and the two closest neighbors will cease to exist.

Extragalactic galaxies. this paragraph].

They are celestial systems similar to the Milky Way, and they are all far beyond the confines of the Milky Way, hence the name "extragalactic galaxies". The Andromeda Galaxy is an extragalactic galaxy located in the constellation Andromeda. Extragalactic galaxies, like the Milky Way, are made up of a large number of stars, star clusters, nebulae, and interstellar matter.

There are currently 1 billion galaxies we have observed.

The Solar System (Solar

system) is the star system we are in now. It is composed of the Sun, 8 large planets (there were originally nine planets, because Pluto was excluded as a dwarf planet (the original 67 were excluded, Pluto's moons were excluded), and countless asteroids, comets, and meteorites. The order of the planets from the Sun outward is:

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Mercury, Venus, Earth, and Mars, which are closer to the Sun, are called terrestrial

planets）。Spacecraft have explored them all, and have landed on Mars and Venus, with important results. Their common characteristics are high density (> grams cubic centimeters), small size, slow rotation, few satellites, mainly silicate (silicate) in internal composition, and a solid shell.

Jupiter, Saturn, Uranus, and Neptune, which are farther away from the Sun, are called Jupiter-like planets (Jovian

planets）。They both have a thick atmosphere, the surface features of which are difficult to understand, and it is generally inferred that they all have solid cores similar to those of terrestrial planets. Between Mars and Jupiter there are more than 100,000 asteroids (irregular small bodies made of rocks).

It is speculated that they may have been formed by the fragmentation of a planet between Mars and Jupiter, or some stony fragments that failed to accumulate into a unified planet. Meteorites exist between planets and are made of stone or iron.

The solar system belongs to the Milky Way.

The Milky Way, the Milky Way and about 40 groups of galaxies of varying sizes, including the Andromeda Galaxy, are a group of galaxies. The Local Group is part of a massive group of galaxies and a group of galaxies centered on the Virgo Cluster.

The Milky Way is a type of spiral galaxy (a type of spiral galaxy) in which the solar system is located, with an elliptical disk shape and a huge disk structure, and the latest research shows that the river system has four well-defined and fairly symmetrical spiral arms, which are 4,500 light-years apart. The number of stars in the Milky Way is between 100 billion and 400 billion.

The solar system includes galaxies such as Venus, Jupiter, Mercury, Mars, Saturn, Uranus, Neptune, Earth, etc. The solar system (solarsystem) is a system of celestial bodies around which the surrounding planets, moons, asteroids, and comets are maintained by its massive gravitational pull.

The Sun is located about 10,000 light-years from the center of the Milky Way (the galactic center) and 10,000 light-years from the edge. The Milky Way is about 100,000 light-years in diameter and contains 150 billion stars, and the Sun is just one of them. The Sun orbits the galactic center at a speed of 250 kilometers per second, about 100 million years, and the Earth's climate and nature as a whole undergo cyclical changes for 100 million years.