Results for “what are stars” · retrieved September 22, 2026
A star is a massive, luminous sphere of plasma held together by its own gravity, powered by nuclear fusion in its core.
Answer details
Formation
Stars form from the gravitational collapse of large clouds of gas and dust, known as molecular clouds or nebulae.
Energy Source
The primary energy source for most stars is the nuclear fusion of hydrogen into helium, which creates the pressure needed to counteract gravitational collapse.
Life Cycle and Fate
A star's evolution and ultimate fate—such as becoming a white dwarf, neutron star, or black hole—are primarily determined by its total mass.
Stellar Systems
Stars are the fundamental building blocks of galaxies and often exist in groups, such as pairs, multiple systems, or clusters.
Sources 8
About this answerStar Basics
Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements. Every star has its own life cycle, ranging from a few million to trillions of years, and its properties change as it ages....Stars form in large clouds of gas and dust called molecular clouds. Molecular clouds range from 1,000 to 10 million times the mass of the Sun and can span as much as hundreds of light-years. Molecular clouds are cold wh
August 12, 2026
Star | Definition, Light, Names, & Facts | Britannica
have extensive knowledge, whether from...by working on that content or...study for an advanced degree.... Britannica Editors May 15, 2026 • History Table of Contents What is a star?...A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye....star,
August 23, 1998
Star
A star is a luminous spheroid of plasma held together by self-gravity. [1] The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known sta
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What Is a Star? | Scientific American
In a very broad sense, a star is simply one of those twinkling points of light you can see in the night sky. But that’s not terribly satisfying in either lexicological or physical terms. After all, we also know the sun is a star—but, by definition, we never see it in Earth’s night sky, and it’s certainly not a dot (unless you’re viewing it from well past Pluto, that is)....If such a basic definition leaves us a bit dry, then perhaps we can do bet
April 11, 2025
Imagine the Universe!
A star is a sphere of gas held together by its own gravity. The closest star to Earth is our very own Sun, so we have an example nearby that astronomers can study in detail. The lessons we learn about the Sun can be applied to other stars....A star's life is a constant struggle against the force of gravity. Gravity constantly works to try and cause the star to collapse. The star's core, however is very hot which creates pressure within the gas. T
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Stars—facts and information | National Geographic
be: Emit, emit,...Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth. They are the building blocks of galaxies, of which there are billions in the universe. It’s impossible to know how many stars exist, but astronomers estimate that in our Milky Way galaxy alone, th
March 20, 2019
What is a Star? (article) | Stars
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What are stars and how are they formed? - BBC Bitesize
What are stars and how are...formed? -...Our Sun was formed around 4.6 billion years ago from a giant cloud called a stellar nebula close nebula A cloud of gas and dust in outer space. If massive enough, these can collapse under gravity to form a protostar., mainly made up of hydrogen gas and dust....The hot core in the centre is called...close protostar The...The collapsing and joining...At this temperature and pressure nuclear fusion close nucl
January 21, 2026
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