Results for “what are stars made of” · retrieved September 22, 2026
Stars are primarily composed of hot, ionized gas, consisting of approximately 73 to 75 percent hydrogen and 24 to 27 percent helium.
Answer details
State of Matter
Stars are composed of plasma, a hot, ionized gas where atoms are stripped of their electrons, creating a soup of protons and free electrons.
Chemical Composition
Hydrogen and helium make up the vast majority of a star's mass, while heavier elements like carbon, nitrogen, oxygen, and iron make up the remaining small fraction.
Recycled Material
Heavier elements in stars are recycled from previous generations of stars that exploded or shed their material, meaning newer stars can have higher concentrations of these metals.
Energy Production
Stars generate energy through nuclear fusion in their cores, where hydrogen atoms are squeezed together to form helium, releasing immense amounts of energy.
Sources 8
About this answerWhat are stars made of? - Cool Cosmos - Caltech
Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements. Most stars have small amounts of heavier elements like carbon, nitrogen, oxygen and iron, which were created by stars that existed before them. After a star runs out of fuel, it ejects much of its material back into space. New star
Publication date not supplied
Star 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
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 h
Publication date not supplied
15.1 The Structure and Composition of the Sun - Astronomy | OpenStax
Let’s begin by asking what the solar atmosphere is made of. As explained in Radiation and Spectra, we can use a star’s absorption line spectrum to determine what elements are present. It turns out that the Sun contains the same elements as Earth but not in the same proportions. About 73% of the Sun’s mass is hydrogen, and another 25% is helium. All the other chemical elements (including those we know and love in our own bodies, such as carbon, ox
Publication date not supplied
What are Stars Made Of?
Did you ever wonder what stars are made of? You might not be surprised to know that stars are made of the same stuff as the rest of the Universe: 73% hydrogen, 25% helium, and the last 2% is all the other elements. That's it. Except for a few differences here and there, stars are made of pretty much the same stuff....The Universe kept expanding and cooling down, and eventually the hydrogen and helium cooled down to the point that it could actuall
Publication date not supplied
What are stars made of? A century ago, this woman found out—and changed physics forever | National Geographic
In 1925, grad student Cecilia Payne first proposed that stars were mostly made of hydrogen and helium and shaped our understanding of the universe....Humans have observed the stars for millennia, ever since our ancestors looked toward the sky. Throughout our history, the sparkling patterns of light upon the inky black sky have acted as compasses and calendars, told stories of gods and goddesses, and inspired poets and artists. But humanity’s rela
January 1, 2025
Star | Definition, Light, Names, & Facts | Britannica
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....form in groups because...in molecular gases...This article describes the properties and evolution of individual stars. Included in the discussion are the sizes, energetics, temperatures, mas
August 23, 1998
How Do We Know What Stars Are Made Of?
Roughly three quarters of the Sun’s mass is hydrogen. That number does not come from reading a hydrogen line in the Sun’s spectrum, because the solar photospheric spectrum cannot supply one. Maria Bergemann, Katharina Lodders and Herbert Palme, in a 2025 chapter for the Encyclopedia of Astrophysics, list hydrogen and the noble gases as not measurable in that spectrum at all. The method that told us what stars are made of has a hole in the middle
September 6, 2026
Keep exploring
Related on this site
This page was prepared by Seeked from live retrieval on September 22, 2026 and is not continuously updated. Run a fresh search for the latest, or to inspect each source.