Star pool Libra
Publish: 2021-04-28 11:48:31
1. 1 The celestial bodies and matter in the universe
the universe is the universe, the material world“ "Universe" is the concept of space, which is boundless“ "Zhou" is the concept of time, which has no beginning and no end
the universe is the unity of infinite space and infinite time
all kinds of materials, such as stars, planets, gases, st, electromagnetic waves, are constantly moving and changing in the space
the largest modern optical telescope has been able to observe 15 billion l.y. (light years) of distant targets (1 l.y. ≈ 9.46) × 1012 km), which is the part of the universe that humans can observe today
stars are the most important objects in the universe. Stars are spherical or spherical objects composed of hot gas and can emit light by themselves. The gas that makes up stars is mainly hydrogen, followed by helium, with few other elements. The sun is a typical and ordinary star
the huge mass is the basic reason for stars to emit light
e to its large mass and high temperature and pressure, thermonuclear reaction from hydrogen fusion to helium is carried out, which releases huge energy to maintain luminescence. The higher the temperature of the star, the shorter the wave length of the radiated energy, so the color of the star turns blue; On the contrary, the color turns red
the masses of stars are almost the same, mostly between 0.1 and 10 times the mass of the sun
the size of stars varies greatly. The diameter of large stars is about 2000 times that of the sun, while the diameter of small stars is less than 1000 km, which is smaller than that of the moon; As a result, the average density of stars varies greatly
the brightness of stars observed with the naked eye on earth is called brightness. In ancient times, the brightness of stars was divided into six levels, called apparent magnitude. Among them, the 15 brightest stars are called first-class stars, while the darkest stars that can be recognized by normal vision are called sixth-class stars
the quantitative relationship between apparent magnitude and brightness: first order stars are 100 times brighter than sixth order stars, and each difference of apparent magnitude is 2.512 times brighter. The brightness of a star is affected by the distance from the star to the earth, so it does not fully represent the real luminous ability of the star itself. The luminous ability of the star itself is called luminosity, and the level of luminosity is called absolute magnitude
there is a vast space between stars, which is called interstellar space. The extremely thin matter that pervades the interstellar space is called interstellar matter. There are two main types of interstellar matter: interstellar gas and interstellar st
interstellar gases include gaseous atoms, molecules, electrons and ions, among which hydrogen is the most, followed by helium, and other elements are few
interstellar st is a tiny solid particle, which is dispersed in interstellar gas. Its main components are ice like matter of water, ammonia and methane, as well as minerals such as silica, ferric silicate and ferric oxide
interstellar matter is very thin, generally only 0.1 particles per cubic centimeter
in some interstellar space regions, the density can exceed 10 or even 1000 per cubic centimeter, which are called interstellar clouds
compared with interstellar clouds, nebulae are larger and denser forms of interstellar matter<
the rose Nebula in the constellation Kirin
(a baby star about 500000 years old)
the Ring Nebula in the constellation Lyra
(the center is a white dwarf)
the stinky egg Nebula in the formation
the matter in the universe moves, and the main way of motion is that the celestial bodies attract and circle each other according to certain systems and rules, forming different levels of celestial systems. For example, the moon and the earth constitute the Earth Moon system; The earth and other planets revolve around the sun, they and the sun constitute a higher level celestial system, namely the solar system; The solar system is a tiny part of the Milky way, a higher level celestial system. There are more than 100-200 billion stars like the sun in the Milky way
beyond the Milky way, there are many massive celestial systems with the same scale as the Milky way, which are called extragalactic galaxies. There are more than one billion such galaxies in the universe that we can observe today
generally, the part of the universe we are observing is called the total galaxy, which is the highest level celestial system known now< (2) the relative position of celestial bodies in the universe
the celestial sphere is an imaginary sphere introced to study the position and motion of celestial bodies in the sky. Its center is the center of the earth where the observer is, and its radius is infinite. In this way, the celestial bodies outside the earth have their own projection positions on the celestial sphere
the earth's rotation axis extends infinitely and intersects the celestial sphere at two points, which is called the celestial pole; The two poles in the same direction as the South and north poles of the earth are called the south celestial pole and the north celestial pole respectively. The equatorial plane of the earth expands infinitely, and the great circle intersecting with the celestial sphere is called the celestial equator. With the celestial pole and celestial equator, the celestial sphere can determine its own longitude and latitude, which are called right ascension and right ascension respectively
Figure 1-2 projection of celestial bodies on the celestial sphere
celestial pole and celestial equator on the celestial sphere
Ursa Major figure
in order to understand stars easily, people divide the stars on the celestial sphere into several groups, each group of stars has its own unique shape and occupies a certain space, such a stellar group is called constellation
the whole celestial sphere can be divided into 88 constellations
four lobed concise constellations
the sphere of the celestial sphere is divided into four star regions according to the different right ascension, and each star region crosses the right ascension at 6:00 (or 90:00) °) The four star regions can be called the celestial queen region, the Yufu region, the great bear region and the tianqin region according to their respective representative constellations
the sun is a star. Which constellation does it belong to< More than 2000 years ago, Greek astronomer Hipparchus (190-120 BC) divided the zodiac into 12 sections to mark the position of the sun on the ecliptic, with the vernal equinox of 0 °， Since the equinox (0 ° From now on, every 30 days ° The zodiac is a sign named after the main constellations in each house at that time. It is called the zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac
order of the zodiac: Aries March 21 April 20 Taurus April 21 Gemini May 22 Cancer June 23 Leo July 24 August 23 Virgo - August 24 - September 23
Libra - September 24 - October 22
Scorpio - October 23 - November 22
Sagittarius - November 23 - December 22
Capricornus - December 23 - January 20
Aquarius - January 21 - February 19
Pisces-- --From February 20 to March 20
the equinox was in Aries before 2000, and now it has moved to Pisces. The sun moves in Aries from April 18 to May 14 every year, and the two solar terms of the ecliptic, the valley rain and the beginning of summer, are in this constellation.
the universe is the universe, the material world“ "Universe" is the concept of space, which is boundless“ "Zhou" is the concept of time, which has no beginning and no end
the universe is the unity of infinite space and infinite time
all kinds of materials, such as stars, planets, gases, st, electromagnetic waves, are constantly moving and changing in the space
the largest modern optical telescope has been able to observe 15 billion l.y. (light years) of distant targets (1 l.y. ≈ 9.46) × 1012 km), which is the part of the universe that humans can observe today
stars are the most important objects in the universe. Stars are spherical or spherical objects composed of hot gas and can emit light by themselves. The gas that makes up stars is mainly hydrogen, followed by helium, with few other elements. The sun is a typical and ordinary star
the huge mass is the basic reason for stars to emit light
e to its large mass and high temperature and pressure, thermonuclear reaction from hydrogen fusion to helium is carried out, which releases huge energy to maintain luminescence. The higher the temperature of the star, the shorter the wave length of the radiated energy, so the color of the star turns blue; On the contrary, the color turns red
the masses of stars are almost the same, mostly between 0.1 and 10 times the mass of the sun
the size of stars varies greatly. The diameter of large stars is about 2000 times that of the sun, while the diameter of small stars is less than 1000 km, which is smaller than that of the moon; As a result, the average density of stars varies greatly
the brightness of stars observed with the naked eye on earth is called brightness. In ancient times, the brightness of stars was divided into six levels, called apparent magnitude. Among them, the 15 brightest stars are called first-class stars, while the darkest stars that can be recognized by normal vision are called sixth-class stars
the quantitative relationship between apparent magnitude and brightness: first order stars are 100 times brighter than sixth order stars, and each difference of apparent magnitude is 2.512 times brighter. The brightness of a star is affected by the distance from the star to the earth, so it does not fully represent the real luminous ability of the star itself. The luminous ability of the star itself is called luminosity, and the level of luminosity is called absolute magnitude
there is a vast space between stars, which is called interstellar space. The extremely thin matter that pervades the interstellar space is called interstellar matter. There are two main types of interstellar matter: interstellar gas and interstellar st
interstellar gases include gaseous atoms, molecules, electrons and ions, among which hydrogen is the most, followed by helium, and other elements are few
interstellar st is a tiny solid particle, which is dispersed in interstellar gas. Its main components are ice like matter of water, ammonia and methane, as well as minerals such as silica, ferric silicate and ferric oxide
interstellar matter is very thin, generally only 0.1 particles per cubic centimeter
in some interstellar space regions, the density can exceed 10 or even 1000 per cubic centimeter, which are called interstellar clouds
compared with interstellar clouds, nebulae are larger and denser forms of interstellar matter<
the rose Nebula in the constellation Kirin
(a baby star about 500000 years old)
the Ring Nebula in the constellation Lyra
(the center is a white dwarf)
the stinky egg Nebula in the formation
the matter in the universe moves, and the main way of motion is that the celestial bodies attract and circle each other according to certain systems and rules, forming different levels of celestial systems. For example, the moon and the earth constitute the Earth Moon system; The earth and other planets revolve around the sun, they and the sun constitute a higher level celestial system, namely the solar system; The solar system is a tiny part of the Milky way, a higher level celestial system. There are more than 100-200 billion stars like the sun in the Milky way
beyond the Milky way, there are many massive celestial systems with the same scale as the Milky way, which are called extragalactic galaxies. There are more than one billion such galaxies in the universe that we can observe today
generally, the part of the universe we are observing is called the total galaxy, which is the highest level celestial system known now< (2) the relative position of celestial bodies in the universe
the celestial sphere is an imaginary sphere introced to study the position and motion of celestial bodies in the sky. Its center is the center of the earth where the observer is, and its radius is infinite. In this way, the celestial bodies outside the earth have their own projection positions on the celestial sphere
the earth's rotation axis extends infinitely and intersects the celestial sphere at two points, which is called the celestial pole; The two poles in the same direction as the South and north poles of the earth are called the south celestial pole and the north celestial pole respectively. The equatorial plane of the earth expands infinitely, and the great circle intersecting with the celestial sphere is called the celestial equator. With the celestial pole and celestial equator, the celestial sphere can determine its own longitude and latitude, which are called right ascension and right ascension respectively
Figure 1-2 projection of celestial bodies on the celestial sphere
celestial pole and celestial equator on the celestial sphere
Ursa Major figure
in order to understand stars easily, people divide the stars on the celestial sphere into several groups, each group of stars has its own unique shape and occupies a certain space, such a stellar group is called constellation
the whole celestial sphere can be divided into 88 constellations
four lobed concise constellations
the sphere of the celestial sphere is divided into four star regions according to the different right ascension, and each star region crosses the right ascension at 6:00 (or 90:00) °) The four star regions can be called the celestial queen region, the Yufu region, the great bear region and the tianqin region according to their respective representative constellations
the sun is a star. Which constellation does it belong to< More than 2000 years ago, Greek astronomer Hipparchus (190-120 BC) divided the zodiac into 12 sections to mark the position of the sun on the ecliptic, with the vernal equinox of 0 °， Since the equinox (0 ° From now on, every 30 days ° The zodiac is a sign named after the main constellations in each house at that time. It is called the zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac Zodiac
order of the zodiac: Aries March 21 April 20 Taurus April 21 Gemini May 22 Cancer June 23 Leo July 24 August 23 Virgo - August 24 - September 23
Libra - September 24 - October 22
Scorpio - October 23 - November 22
Sagittarius - November 23 - December 22
Capricornus - December 23 - January 20
Aquarius - January 21 - February 19
Pisces-- --From February 20 to March 20
the equinox was in Aries before 2000, and now it has moved to Pisces. The sun moves in Aries from April 18 to May 14 every year, and the two solar terms of the ecliptic, the valley rain and the beginning of summer, are in this constellation.
2. This problem you go to the tattoo shop is charged, in this no one gives you free design, cheap no good goods, what's more, tattoo cheap design cheap works tattoo life is not worth it
3. What is Libra? What game do you play? How do you answer your questions? Game is entertainment, depending on your personal preferences, personality, constellation reliable? So many Libras are close? Absolutely impossible, everyone is different, so it depends on your choice. Now there are many types of games, such as stand-alone online games, QQ is not so many games. Strategy of the Three Kingdoms Zhixin long Ye Wang competitive StarCraft Warcraft CS... All kinds of play.
online game turn system dream journey to the west, stone age Magic Baby are more cartoon
RPG (role play) ARPG (Action Role play) now the New Dragon Valley DNF dragon eight too many...
there are yitian Black please close your eyes to kill three kingdoms. Too many..
can't say one by one. The key is you. It depends on how you choose! Words from the bottom of my heart. I'm sorry
online game turn system dream journey to the west, stone age Magic Baby are more cartoon
RPG (role play) ARPG (Action Role play) now the New Dragon Valley DNF dragon eight too many...
there are yitian Black please close your eyes to kill three kingdoms. Too many..
can't say one by one. The key is you. It depends on how you choose! Words from the bottom of my heart. I'm sorry
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