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coalsack是什么意思，coalsack翻译
Coal Sack
A coal sack is a dark, irregularly shaped region in space that appears to be a gap in the diffuse light of the Milky Way. It is called a coal sack because it resembles a sack of coal when observed from Earth. These structures are found in the halo of the Milky Way galaxy and are composed of cold, dark matter.
The formation of coal sacks is still not fully understood, but it is believed that they are formed from the remnants of gas and dust clouds from which stars were formed in the past. As these stars formed, they left behind pockets of gas and dust that were not used in their formation. These pockets then collapsed under their own gravity to form coal sacks.
Coal sacks are an important part of the evolution of galaxies. They are thought to play a role in the formation of new stars and the shaping of the structure of galaxies. They are also believed to be a source of dark matter, which is thought to make up a large portion of the mass of galaxies.
Observations of coal sacks have provided valuable information about the properties of dark matter. Because they are dark and do not emit light, they can only be detected by their gravitational effects on nearby objects. By studying the way that light passes through coal sacks, astronomers can infer the presence of dark matter and study its properties.
In recent years, the study of coal sacks has become an important field of research in astronomy. With the advent of new technology, such as the Hubble Space Telescope and the Large Millimeter Array, astronomers are able to study coal sacks in greater detail than ever before. This has led to new discoveries about the nature of dark matter and the evolution of galaxies.
In conclusion, coal sacks are dark, irregularly shaped regions in the halo of the Milky Way galaxy that are composed of cold, dark matter. They are an important part of the evolution of galaxies and are a source of dark matter. The study of coal sacks is providing valuable information about the properties of dark matter and the shaping of galaxies. With the help of new technology, astronomers are able to study coal sacks in greater detail than ever before, leading to new discoveries and a better understanding of the universe.