How many stars are there in the sky? What is the name of the planet farthest from Earth?

The ninth planet in the solar system, and the farthest known planet, is about 5.7 billion kilometers away from Earth at its closest. If you send a beam of light from Earth to Pluto, you have to walk for more than 5 hours.

Pluto is also not the boundary of the solar system. There are comets orbiting the Sun that come from tens of billions of kilometers away, hundreds of times or even thousands of times farther than Pluto.

However, these celestial bodies are, after all, objects within the solar system. Any star we see in the night sky is much farther than that. A bright star in the constellation Centauri in the starry sky of the southern sky, Southgate II, is the closest star to our solar system, about light-years away.

It takes more than 4 years for the light emitted from the South Gate II to reach the Earth. But South Gate II is not the brightest star in the sky, the brightest star is Sirius, which is about 8 light-years away. The famous Cowherd and Vega are 16 and 27 light-years away, respectively.

There are only a few dozen stars within a few tens of light-years away from us, and most of them are hundreds to tens of thousands of light-years away. All of these stars, including our solar system, make up a galaxy about 100,000 light-years in diameter.

Further afield, we can't tell the stars with the naked eye. It's an extragalactic galaxy that is farther away than our own Milky Way. To the naked eye, they appear to be just a small blurry cloud.

The closest extragalactic galaxy to us is the Great Magellanic Cloud in the southern sky, 170,000 light-years away. In the autumn night sky there is the famous Andromeda Nebula, a distant galaxy about 2.2 million light-years away, and it is difficult to distinguish the stars that make it even in large telescopes. Dozens of galaxies, including them and our own Milky Way, make up a group of galaxies with a diameter of about 6 million light-years, called the Local Group of Galaxies.

Beyond the local group of galaxies are farther and larger groups of galaxies. For example, the Virgo Cluster (about 2,000 galaxies) is 50 million light-years away, and the Comae Cluster (about 10,000 galaxies) is 100 million light-years away. Tens of thousands of such groups of galaxies have been discovered, as far away as 8 billion light-years.

A celestial body discovered in the sixties of this century, which looks like a star on the outside, but has more energy than a galaxy, astronomers call it a quasar. It is currently the most distant celestial body known to man. In the 80s, Australian scientists discovered a quasar as far away as 20 billion light years!

The so-called stars are the stars in the universe other than the sun.

Because the universe is boundless, the farthest (or brightest) star from Earth is still unknown!

In terms of the number of stars that can be seen by the naked eye, there are no more than 7,000 in total. And since people standing on Earth can only see half of the sky overhead, we usually see only about 3,500 stars. Everyone knows that the stars in the sky are bright and dark.

As early as 2,000 years ago, astronomers lined up the stars according to their brightness, calling the brightest ones "1st magnitude stars", and the slightly inferior ones "2nd magnitude stars" and "3rd magnitude stars", ......The faintest star that can be seen by the naked eye is a star of magnitude 6. In fact, in the entire sky, there are only 20 stars of the 1st magnitude, 46 stars of the 2nd magnitude, 134 stars of the 3rd magnitude, 458 stars of the 4th magnitude, 1476 stars of the 5th magnitude, and 4840 stars of the 6th magnitude. From the 1st magnitude to the 6th magnitude stars, there are 6,974 in total, and even if you add Mercury, Venus, Mars, Jupiter, Saturn and other planets and the Sun, it is only 6,980.

Of course, this is limited to the stars visible to the naked eye, not the actual number of stars in the sky. The actual number of stars in the Hand Universe is indeed an astronomical number. You just have to look at it with a telescope.

The number of stars in telescopes is exponentially greater than what can be seen with the naked eye, and the larger the telescope used, the more stars can be seen. For example, a small binoculars can see about 7 or 8 magnitude stars; 14th magnitude stars can be seen with a 120 (lens diameter of 120 mm) telescope manufactured by Nanjing Astronomical Instrument Factory; If you use the 5-meter telescope on Palomar Mountain in the United States, you can see 21 magnitude stars, that is, Peiliang, or nearly 2 billion. In fact, even if you use an astronomical telescope with a diameter of 5 meters to observe the stars, you can only see a drop in the ocean.

The stars in the vast universe are actually innumerable. The Milky Way, where our sun is located, is generally estimated to contain 1 5 lo", or about 150 billion stars, and mankind has observed dozens of such "galaxies" by current observation methodsEveryone knows that what is "observed now" is far from the whole universe.

Therefore, in this sense, the stars in the sky are indeed uncountable. ,3,How many stars are there in the sky? How many planets or stars are there in the universe?

If you want to be more detailed, please!

Due to the autobiography and revolution of the planets, the distance between the Earth and other planets varies, and the closest planet to Earth is Venus. The distance between Venus and Earth varies between 100 million kilometers and 100 million kilometers, so for most of the time, Venus is the closest planet to Earth in the solar system.

Venus is one of the eight planets in the solar system and is the second planet in descending order from the Sun. It is the closest planet to Earth. In ancient China, it was called Taibai or Taibai Star.

Venus is the brightest star in the whole day apart from the Sun and Moon, it is sometimes the morning star, appears in the eastern sky before dawn, and is called "enlightenment"; Sometimes it is a twilight star, which appears in the western sky after dusk and is called "Chang Gung". Venus, like Mercury, is the only two large planets in the solar system that do not have a natural satellite. Venus is surrounded by a dense atmosphere and clouds.

In the atmosphere of Venus, carbon dioxide is the most abundant, accounting for more than 97%. At the same time, there is a dense cloud of concentrated sulfuric acid up to 20 30 kilometers thick. Venus's surface is very arid, so the rocks on Venus are harder than those on Earth, resulting in steeper mountains, cliffs, and other landforms.

The surface temperature of Venus is as high as 465 to 485, and the atmospheric pressure is about 90 times that of Earth. There was also thunder and lightning on Venus, with the largest lightning ever recorded lasting 15 minutes. Venus has a special rotation in that it is the only large planet in the solar system that rotates in a reverse direction, opposite to the other planets, from east to west.

Therefore, as seen from Venus, the Sun rises in the west and sets in the east. The sky of Venus is orange-yellow.

The Sun is the only star in the solar system, and there are 8 planets revolving around it, namely our eight planets, Uranus and Neptune. Venus and Mars are the closest planets to Earth.

Mars is not the closest planet to Earth – the closest is Venus. But Mars is still considered the most likely place in the solar system where life has flourished and survived to this day, outside of Earth. The surface of Venus is unusually hot, and there are 500 of them.

Its atmosphere is mainly composed of carbon dioxide and contains a large number of corrosive and toxic gases. The strong greenhouse effect produced by these gases largely determines the high temperature conditions on the surface of Venus.

Venus is the closest planet to Earth, with an average distance of about 41.5 million kilometers. Mars The distance between Earth and 55.7 million kilometers is between 120 million kilometers.

Venus, just give an answer.

The nine planets are, in descending order from closest to the Sun: Water, Gold, Earth, Fire, Earth, Sea and Pluto (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto).

Mars, arranged in water, gold, earth, fire, wood, earth, heaven and sea, is closer to Venus...

The closest planet to the earth is called Venus, which is about the same volume and mass as the earth, but the ecological environment is completely opposite, one heaven and one hell, and it is a pair of sister planets that look like gods!

Aren't people always water Martians? Explain why Mars is close to us, always coming to the door.