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Stars are found in large groups called galaxies. A galaxy may contain millions or even hundreds of billions of stars, plus gas and dust. Stars are huge, glowing balls of gases. The closest star to Earth is the Sun. Most of the pinpricks of light that shine in the night sky are also stars.
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In the last century, scientists determined what stars are—enormous balls of incandescent gas, powered by nuclear fusion reactions in their cores—and that the Sun is one of them. Many ancient cultures believed that the stars were lights attached to a huge dome (the sky) over Earth.
A star is a massive, bright, sphere of very hot gas called plasma which is held together by its own gravity. Stars radiate energy created from nuclear fusion, which is a process that takes place in a star's core and involves hydrogen fusing (burning) to make helium.
21 Μαΐ 2024 · A massive star is a star with a mass eight times greater than that of the Sun. It is difficult for stars to get this large, as a number of factors influence stellar development and these factors often limit size, but astronomers have been able to observe massive stars up to 150 times larger than the Sun, illustrating that it is possible under ...
21 Νοε 2023 · A massive star is a star that is larger than eight solar masses during its regular main sequence lifetime. Massive stars are born, just like average stars, out of clouds of dust...
Star: A star is a huge, bright ball of burning gas that is held together by gravity. Stars contain mostly hydrogen as well as helium and smaller amounts of other elements. The Sun is the closest star to Earth. Sun: The Sun is a star and the biggest object in the Solar System, it burns brightly in the center as planets and other objects orbit ...
What is a star? Stars are giant spheres of superhot gas made up mostly of hydrogen and helium. Stars get so hot by burning hydrogen into helium in a process called nuclear fusion. This is what makes them so hot and bright. Our Sun is a star. Lifecycle of a star. Birth - Stars start out in giant clouds of dust called nebulae. Gravity forces the ...
