Why is the sun called a star? We all have always wondered about the sun, the moon and everything about this universe. Most of the things in the universe that have never been discovered properly are so mysterious and thus it makes us realize our limits as merely a living creatures on a planet called Earth.
The sun is a star, but why and how? Let’s get to know that.
The Sun is the central star of our Solar System. This ‘ball of fire’ is a nearly perfect sphere of hot plasma. It is believed to be heated to incandescence in its core by nuclear fusion reactions and emitting energy mostly as visible light, ultraviolet light, and infrared radiation. It is, without a doubt, the most vital source of energy for life on Earth. It has a diameter of approximately 109 times that of the Earth. It has a mass of around 330,000 times that of Earth and makes up 99.86 percent of the Solar System’s total mass. Hydrogen makes up roughly three-quarters of the Sun’s mass, while helium makes up the rest, with considerably lesser amounts of heavier elements including oxygen, carbon, neon, and iron.
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The Sun: A Star
Every second, the Sun’s core fuses approximately 600 million tonnes of hydrogen into helium, transforming 4 million tonnes of substance into energy. The Sun’s light and heat come from this energy, which takes between 10,000 and 170,000 years to escape the core. When hydrogen fusion in the Sun’s core reaches a point where it is no longer in hydrostatic equilibrium, the Sun’s core will experience a significant rise in density and temperature, while its outer layers expand, converting the Sun into a red giant. The Sun will eventually grow huge enough to encompass the current orbits of Mercury and Venus, rendering Earth uninhabitable — but not for another five billion years. It will then shed its outer layers and become a white dwarf, a dense sort of cooling star that no longer produces energy through fusion but still glows and emits heat from its prior fusion.
Since prehistoric times, people have acknowledged the Sun’s huge impact on the Earth. Some tribes considered the Sun to be a divinity. Solar calendars are based on the Earth’s synodic rotation and orbit around the Sun, one of which being the Gregorian calendar, which is the most widely used calendar today.
The predominant fusion process since the Sun’s formation has been the conversion of hydrogen to helium. The amount of helium and its location within the Sun have gradually altered over the last 4.6 billion years. Due to fusion, the proportion of helium within the core has increased from around 24 per cent to about 60 per cent, and some helium and heavy elements have settled from the photosphere towards the Sun’s core due to gravity.
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Is the sun referred to as a star?
The Sun is a celestial body. There are many stars, but the Sun is the one that is closest to Earth.
What colour does the sun have?
A spectrum is the range of colours or frequencies in a beam of light. When solar rays pass through a prism, all of the colours of the rainbow emerge on the other side.
Why is Venus referred to as the Earth’s sister?
Because of their similar size, mass, density, composition, and gravity, Venus and Earth are often referred to as twins.
What is the hottest planet in the universe?
Venus is the hottest planet in our solar system due to its close closeness to the Sun and dense atmosphere.
How long do stars exist?
The more massive a star is, the faster its fuel supply depletes and the shorter its life becomes. After only a few million years of fusion, the most massive stars can burn up and explode in a supernova. A star of the Sun’s mass, on the other hand, can keep fusing hydrogen for around 10 billion years.