A star is a huge luminous celestial body that is composed of gas and produces its own light. The best example of a star is our Sun in the Solar System.
Stars are commonly made mostly of seventy five percent hydrogen and twenty five percent helium. But stars also has small amounts of other elements in them.
TEMPERATURE AND COLOR
Temperature also varies from star to star. These large difference in their temperature result in differences in color. Stars may range in color from red, which indicates a much cooler temperature, to blue which indicates an extremely hot star.
Basically, stars are big exploding balls of gas, mostly hydrogen and helium. Our nearest star, the Sun, is so hot that the huge amount of hydrogen is undergoing a constant star-wide nuclear reaction, like in a hydrogen bomb. Even though it is constantly exploding in a nuclear reaction, the Sun and other stars are so large and have so much matter in them that it will take billions of years for the explosion to use all the "fuel" in the star. The huge reactions taking place in stars are constantly releasing energy (called electromagnetic radiation) into the universe, which is why we can see them and find them on radio telescopes such as the ones in the Deep Space Network (DSN). Stars, including the Sun, also send out a solar wind and burst out occasional solar flares.
The Saggitarius Star Cloud, found at the center of our galaxy. Star color is linked to temperature. A relatively cool, yellow star like our Sun would seem dim in this photograph. Hubble Space Telescope Image from the Astronomy Picture of the Day Archive.
Scientists think that the core of the Sun is a 15 million degree Celsius plasma, a soup of electrons and protons that are stripped from hydrogen atoms. This "soup," called plasma, makes up 90 percent of the Sun. Every second, thousands of protons in the Sun's core collide with other protons to produce helium nuclei in a nuclear fusion reaction that releases energy. Just outside the core, energy moves outward by a process called radiation. Closer to the surface, the energy moves out by a process called convection - hot gases rise, cool, and sink back down again. As these masses of gas move, they push off of each other causing "Sun-quakes." These make the material in the Sun vibrate. These Sun-quakes help scientists determine the Sun's internal structure and the processes occurring at different locations underneath the Sun's surface.
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WHAT STAR ARE MADE OF?
COMPOSITION
A star is a huge luminous celestial body that is composed of gas and produces its own light. The best example of a star is our Sun in the Solar System.
Stars are commonly made mostly of seventy five percent hydrogen and twenty five percent helium. But stars also has small amounts of other elements in them.
TEMPERATURE AND COLOR
Temperature also varies from star to star. These large difference in their temperature result in differences in color. Stars may range in color from red, which indicates a much cooler temperature, to blue which indicates an extremely hot star.
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Answer:
What are stars made of?
Basically, stars are big exploding balls of gas, mostly hydrogen and helium. Our nearest star, the Sun, is so hot that the huge amount of hydrogen is undergoing a constant star-wide nuclear reaction, like in a hydrogen bomb. Even though it is constantly exploding in a nuclear reaction, the Sun and other stars are so large and have so much matter in them that it will take billions of years for the explosion to use all the "fuel" in the star. The huge reactions taking place in stars are constantly releasing energy (called electromagnetic radiation) into the universe, which is why we can see them and find them on radio telescopes such as the ones in the Deep Space Network (DSN). Stars, including the Sun, also send out a solar wind and burst out occasional solar flares.
The Saggitarius Star Cloud, found at the center of our galaxy. Star color is linked to temperature. A relatively cool, yellow star like our Sun would seem dim in this photograph. Hubble Space Telescope Image from the Astronomy Picture of the Day Archive.
Scientists think that the core of the Sun is a 15 million degree Celsius plasma, a soup of electrons and protons that are stripped from hydrogen atoms. This "soup," called plasma, makes up 90 percent of the Sun. Every second, thousands of protons in the Sun's core collide with other protons to produce helium nuclei in a nuclear fusion reaction that releases energy. Just outside the core, energy moves outward by a process called radiation. Closer to the surface, the energy moves out by a process called convection - hot gases rise, cool, and sink back down again. As these masses of gas move, they push off of each other causing "Sun-quakes." These make the material in the Sun vibrate. These Sun-quakes help scientists determine the Sun's internal structure and the processes occurring at different locations underneath the Sun's surface.