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Comet
Comets are celestial bodies that revolve around the sun with an oval, parabolic or hyperbolic orbit. The term comet comes from the Greek word "kometes" which means "long hair. Comets are also interpreted as stars with tails.
Javanese people call the comet Lintang Kemukus because it has a "steamed" or dusty tail. Apart from that, the tail also resembles dried cubeb fruit.
The part usually called the comet's tail is a thin, dusty haze that forms from the evaporation of comet material when it approaches the sun.
The length of a comet's tail can reach millions of kilometers and some comets travel greater distances than comets when orbiting the sun.
Due to varying distances, the time it takes for comets to orbit the sun is also different, some comets even need thousands of years to complete one orbit of the sun. The diameter of the comet nucleus is only about 8-25 km.
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The Moon
The moon is one of the celestial bodies that we can see at night. The moon has a yellowish color, which sometimes changes shape according to its circulation.
According to research, the satellite that accompanies the Earth every year will be farther away from the earth, which is why the moon looks smaller every year.
Even though it looks small, in fact the size of the moon is bigger than the planet Pluto with a width of 3500 km or the equivalent of 3 times the size of Java Island.
The moon's rotation itself has a radius of more than six times the length of Java Island.
Every day sometimes the Moon looks to have a different shape. Sometimes full round, half circle and even a crescent moon. Its existence looks so beautiful with the bright light at night.
According to astronomers, the Moon has an uneven surface, the light emitted by the Moon is actually reflected sunlight. Even so, the Moon remains a beautiful decoration of the night sky.
The Sun
The sun is the center of the solar system. All components of the solar system, such as small planets, asteroids, comets, revolve around the sun.
The shape of the sun is round with a diameter 109 times the diameter of the earth.
The mass of the sun consists of hydrogen and helium, the rest is oxygen, iron, neon, and others.
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This sun has a temperature that can be said to be extraordinarily hot. The heat of the sun's core reaches 15 million degrees Celsius. Where the surface temperature of the sun reaches 5,726 degrees Celsius.
With heat reaching 15 million degrees Celsius, this indicates that the sun has a temperature 150 times hotter than boiling water. The radius of the sun is approximately 696 thousand kilometers.
The gravitational pressure possessed by the sun can be said to be very high. Coupled with the effects of nuclear reactions in the sun, it can also produce extraordinary amounts of energy. In the end, this energy is released into space and can be felt on earth.
This energy that comes from the sun can be used to support life on earth. It is humans and plants that use this energy. Therefore, it can be said that the sun is the most important source of energy for living things on earth.
(Penulis: Vanya Karunia Mulia Putri)
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