Star illustration. ©Shutterstock/jupeart
Merdeka.com – Have you ever wondered what a star is when you look up at the sky at night and see a sprinkling of light twinkling overhead? The moon and stars have been known by human civilization since time immemorial, and were used as directions by primitive societies.
The stars scattered in the sky were so numerous that it was impossible for humans to count them. So, what is a star? Stars are celestial bodies that can emit their own light. When viewed up close, the star is shaped like a large ball consisting of various gases that have heat and emit light.
Because the location of the star is very far from the earth where humans see it, the star will look like a point of light. Therefore, to see stars that are very far away, special tools such as telescopes are used. Here’s a full explanation of what it is bintangwhich is definitely interesting for you to know.
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What is a Star?
Stars are giant balls of gas that are very hot. In general, humans refer to celestial bodies that are seen twinkling at night as stars. The stars have an arbitrary arrangement. However, the changes in the composition of the stars are so small that they are difficult to observe.
Quoting Bambang Hidayat in Interstellar Matter, the movement of the stars can only be compared with their position in thousands of years using binoculars or a telescope, so that the shift can be clearly seen.
In addition to this movement, the movement of the stars can also be observed in the radial direction, that is, toward or away from the sun. The movement of the stars toward or away from the sun can prove the rotation of the galaxy.
The sun, planets, satellites, comets, meteors, steroids, and asteroids, are just one of the millions of stars that combine in groups of stars called galaxies. Thus, galaxies are a collection of stars. The galaxy with the sun as one of its members is called the Milky Way galaxy.
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Star Forming Process
After starting to understand what a star is, the next thing that should be known is how the process of star formation. Stars are composed of gases such as hydrogen (H2) about 94%, helium (He) 5%, and 1% of other elements. The temperature of stars varies from 22730 C to 52730 C. Most stars have a mass between 0.1 and 5 times the mass of the sun.
Stars are born in dust clouds and are scattered throughout most of the galaxy. An example is the Orion Nebula. This turbulence within the cloud creates a knot with enough mass that gas and dust can begin to collapse under its own gravitational pull. As the cloud collapses, material at the center begins to heat up, citing science.nasa.gov.
Known as protostars, it is this hot core at the heart of the collapsing cloud that will one day become a star. As the cloud collapses, a dense hot core forms and begins to collect dust and gas. However, not all of this material ends up as part of the star. The remaining dust may become planets, asteroids, or comets or it may remain dust.
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Stars in Ancient History
Thousands of years ago, the land of Ancient Egypt was familiar with astrology. However, their understanding of the stars and aspects of astronomy is still centered in superstition and myths.
Quoting Djakaria M. Nur and Ahmad Yani in the Handout of the Cosmograph Course, the Ancient Egyptian concept of the sun, moon, and stars was still simple and wrong. Earth is still considered the center of the cycle of the sun, moon, and stars.
Certain star formations that form images of animals or others (which are later called constellations) are used as predictions of fate, even bright stars that attract people’s attention will be interpreted as clues to the birth of world leaders.
The legacy of this ancient civilization still exists today. For example, fortune-telling based on the date and month of a person’s birth, which is adjusted to the appearance of certain constellations when a person is born. The constellations used for fortune telling are usually the constellations of the zodiac.
The Zodiac is the 12 constellations along the ecliptic forming a ring around the orbit of the earth around the sun. .