Is there any other astronomical knowledge, is there a website about astronomical knowledge?

Astronomical knowledge covers many aspects, and even the most powerful scientists can't fully explain it, so this range is very wide, since the landlord asked, let's talk about some stars that can be observed now.

Planet: Jupiter.

Jupiter is seen in the east after nightfall, and is said to be the brightest star in the sky at this time, with an apparent magnitude of the star, orbiting in the constellation Aries. Over time, Jupiter will rise higher and higher.

Despite the high level of light pollution and the fact that the air quality is not very good, Jupiter still looks bright because it is bright enough, and it is obvious if you look for it.

Constellations and Stars: Vega in Lyra, at the zenith.

Cowherd star in the constellation Aquila, at the zenith.

Tianjin IV in Cygnus, zenith (these three stars at the zenith are the famous summer triangle, which is now visible when it is dark.) The right angle is Vega, the 30-degree angle is the Cowherd, the 60-degree angle is the Tianjin Four, and the Milky Way is across the Cowherd and Vega).

At this time, you can also see Pegasus, Andromeda, Cassiopeia in the north, Perseus in the east, and Tusikong in Cetus. Aquarius, Capricorn, and Aquarius can be seen in the north, and the north of Fish in the south is also very bright.

As time goes on, some of the winter constellations and bright stars can gradually be seen in the east, and here are the famous constellations and bright stars in winter:

Sirius in Canis Major.

Aldebaran in Taurus.

Auriga's five cars two.

Betelgeuse and Betelgeuse in Orion.

North River 2 and North River 3 in Gemini.

South River III of Canis Minor.

Hope it helps.

The shepherd is missing to return to the astronomical network, the largest astronomical network in our country.

The Star Astronomy Network is not wrong, I have registered.

Sirius Astronomical Network, although it has not been updated for a long time, but if you want to know the stars and constellations, this ** is not wrong, there are pictures and introductions of 88 constellations in it.

Hope it helps.

Why is this total solar eclipse rare in 500 years?

The answer is complicated, simply put, the Earth is near perihelion and the Moon is near perigee.

The universe is generally believed to be formed by a large **, and there is no specific time for the specific time, it seems to be as big as the sun, and there are many stars, which are waiting for human discovery, because the universe is still expanding, and the black hole leads to the white hole (as a famous scientist said) It seems that it can go back to the past or reach outer space.

The universe is finite and boundless [like the surface of the Earth, which has a certain size (i.e., finite) but no edges. The universe is the same, it is finite, but the gravitational pull of the universe itself is so great that it bends the space in the universe back to itself (like a circle, but it is only four-dimensional). ]

There is no matter outside the universe (including time, space, light...).So there is no "thing".

But some scientists believe that there are other "universes" outside of our universe.

When a star more than 100 times more massive than the Sun runs out of fuel, its huge gravitational pull compresses its volume to "0", and the density of this point is infinite, and the gravitational force is also extremely large, and it can even bend space and attract everything from light, electricity, and signals (this point is called a black hole).

First of all, the speed of motion of matter can only be the speed of light, which can be derived from the formula of time dilation ("The Theory of Relativity").

Because matter can only move at the speed of light, when its speed is close to the speed of light, only time slowing down can keep its speed below the speed of light forever, and when speed = speed of light, time stops.

Understand: When the speed of a moving object is close to the speed of light, time slows down, so that if the time of a stationary object (relative to a moving object) has passed 50 years, then the time of a moving object (relative to a stationary object) may have only passed by 1 second, then a person at rest is 50 years older than a person in motion. (Time for moving objects is extremely slow, as slow as 1 second is equivalent to 50 years.) ）

You can read some** similar to the text of the sky.

Blue Sky Astronomical Society, etc.

Knowledge is limitless.

The human self has limited cognition.

My personal advice is to start by knowing the stars in the sky, that is, to also watch the stars, know their location, name, etc., of course, if you live in the city and are in a big city to take it is a pity, and, it is recommended to book? Astronomy enthusiast? Magazines, I'm reading them myself, it's good, and you can go to some related forums, such as Shepherd Astronomy, etc., there are a lot of masters in it, and Crouching Tiger, Hidden Dragon.

The Sun, Moon, and the Earth's three bodies are in the same straight line, with the Moon in the center. The moon blocks the sunlight, and its shadow is cast on the Earth, and the eclipse can be seen in the shadow area.

A solar eclipse is when the moon circles the earth and turns between the sun and the earth, if the sun, the moon, and the earth are exactly lined up or close to a straight line, the moon blocks the sunlight that shoots to the earth, and the black shadow behind the moon falls on the earth, and the solar eclipse phenomenon occurs. People in the shadow of the moon on the earth began to see the sun gradually weakening, the sun surface was obscured by a round black shadow, when the sky turned dark, all the brightest stars and planets could be seen in the sky, and after a few minutes, the sun gradually appeared from the edge of the moon's black shadow, and began to produce light and recircle. Since the Moon is smaller than the Earth, only people in the shadow of the Moon can see the eclipse.

A total solar eclipse occurs when the Moon blocks all the sun, a partial solar eclipse occurs when part of the sun is occluded, and an annular solar eclipse occurs when part of the sun is occluded.

A solar eclipse is when the sun, the moon, and the earth are exactly aligned or close to a straight line, and the moon blocks the sunlight that shoots to the earth, and the black shadow behind the moon falls exactly on the earth, and the solar eclipse phenomenon occurs. Solar and lunar eclipses are typical examples of light propagating in a straight line in celestial bodies. It is not every time a solar eclipse occurs when the moon moves between the sun and the earth, and two conditions need to be met for a solar eclipse to occur.

First, solar eclipses always occur on New Year's Day (the first day of the lunar calendar). Eclipses are not guaranteed on all new suns, because the Moon's orbit (the white path) and the Sun's orbit (the ecliptic) are not in the same plane. The plane of the white and the plane of the ecliptic have an angle of 5°9.

A solar eclipse can occur if both the Sun and the Moon move near the intersection of the white and ecliptic at the New Moon, and the Sun is at a certain angle from the intersection (eclipse limit), which is the second condition to be met. Since the orbits of the Moon and the Earth are not perfectly circular, and the distance between the Sun and the Moon and the Earth is sometimes near and far, the shadow formed by the sun's rays being obscured by the Moon can be divided into umbra, pseudoumbra (formed when the Moon is far away from the Earth) and penumbra on the Earth. The observer is in the umbra range and can see a total solar eclipse; An annular solar eclipse can be seen in the pseudoumbra range; In the penumbra range, only a partial solar eclipse can be seen.

Whether it's a partial solar eclipse, a total solar eclipse, or an annular solar eclipse, the time is very short. When a total solar eclipse occurs, it can be divided into five types of eclipse signs according to the position relationship between the circular plane of the moon and the circular plane of the sun: 1. Initial eclipse.

2 Food. 3 Food. 4 Shine.

5 Round.

The sun, moon and earth are three points and one line, and the moon is in the middle. The moon blocks the sunlight, the shadow casts on the ground, and the shadow area can be used to see the eclipse.

The direction of the comet's tail is always (opposite to the direction of the Sun).

Analyze the reasons for the formation of the above law: ( When the comet is close to the sun, its boiling point of the material volatilizes, the more hail is close to the sun, the more material is thrown, so the longer the comet tail, the larger the comet).

2) What to say for the source on the moon"One day"with"year"The length is equal.

Under the long-term gravitational effect, the center of mass of the moon has no longer been geometrically centered, but on the side close to the earth, as if it is locked by the earth.

Humans can see the starlight of the universe 700 million years ago.

Ongoing annual meeting of the American Association for the Advancement of Science, California.

The School of Engineering announced that a team of astronomers from the School of Engineering used the Hubble Space Telescope and the Keck Observatory Telescope to discover one of the farthest galaxies from Earth in the Abell 2218 galaxy cluster. The light emitted by the galaxy was emitted just 700 million years after the universe was born.

The discovery shows once again that the technique, known as the cosmic lensing effect, is a powerful tool for better understanding the origins of the universe. Further use of this technique could give astronomers a better understanding of how the "Dark Age" ended.

Secret. According to Kneiber, an astronomer at the California Institute of Technology who led the study, the galaxy's "redshift" may be close. This means that due to the expansion of the universe, it will move away from the Earth at an extremely high speed.

The team first detected this new galaxy by using the Hubble Space Telescope's Advanced Investigative Camera to conduct a long-term study of the Abell 2218 galaxy cluster. Analysis of the images obtained for a series of "Hubble" shows that the "redshift" is at least. Later, using the Keck Observatory's 10-meter telescope, astronomers found that the galaxy was "redshifted" closer.

The larger the "redshift", the farther away the object is from the Earth.

Kneiber's "photographing" of the galaxy yielded two very similar images. He said the presence of two images of the same object suggests that the gravitational lensing phenomenon is working. Due to the extremely faint nature of the galaxy, identifying its distance was a particularly challenging task.

Researchers estimate that the galaxy is small, about 2,000 light-years wide, but forms stars at an extremely high rate. And this galaxy is mainly made up of massive stars.

Cowherd and Vega are two stars like the Sun, and they are also capable of emitting light on their own. The Chinese name of the Cowherd Xingzheng Brigade style is Hegu Er; It forms a constellation with several other vertical stars, called the constellation Aquila. The official Chinese name of Vega is Vega I; It and several other stars form a constellation called Lyra.

The names and divisions of the constellations were all imported from the West.

The distance of the Cowherd and Vega from Earth: The Cowherd is 16 light-years and Vega is 27 light-years. The distance between them is also very far, 16 light years, that is to say, the fastest light and electricity, from the Cowherd Star to Vega Star also have to run non-stop for 16 years, not to mention other means of transportation.

The surface temperature of Cowherd reaches 8,000 degrees Celsius, while Vega is even higher at 11,000 degrees Celsius. In terms of size, Vega is also larger than the Cowherd, the diameter of Vega is 3 times that of our sun, and the diameter of Cowherd is 1 6 times.