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The change is mainly chronological ... in the beginning there was only hydrogen and helium, then as stars aged and exploded, heavier elements were introduced into the interstellar medium, and were thus incorporated into newer stars.

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Do stars vary greatly in size and color only.?

No. Stars vary in lots of aspects, including:* Diameter * Mass * Color (and the related surface temperature) * Chemical composition * Density (related to mass and diameter) * Brightness


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The composition is determined by spectral analysis.


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Stars contain hydrogen, helium and a little iron.


Spectrum indicates what in the stars atmosphere?

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Is fixed composition a caracteritic of a mixture?

A fixed composition is not a characteristic of a mixture. The composition of a mixture can vary, unlike the composition of a compound that forms a chemical reaction.


What makes a star's spectrum appear to be different from another stars?

The chemical composition of the star.


What is an astrochemist?

An astrochemist is an expert in astrochemistry, the study of the chemical composition of stars and outer space.


Are all stars made up of the same chemical composition?

No. It varies but most are same.


Why won't the method used to discover the chemical composition of stars work for the moon and planets?

The method used to discover the chemical composition of stars, called spectroscopy, is not as effective for the Moon and planets because they do not emit light like stars do. Instead, they reflect light from the Sun, which makes it more challenging to accurately determine their chemical composition through spectroscopy.


Are all the stars the same?

No. Stars vary in mass, color, size, temperature, and composition of trace elements.


How does a spectrograph provide information about stars chemical composition?

A spectrograph breaks down the light from stars into its component colors or wavelengths. Each chemical element absorbs and emits light at specific wavelengths, creating a unique fingerprint called a spectral line. By analyzing the spectral lines in a star's light, scientists can determine its chemical composition.


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The composition of pure substances, such as elements and compounds, are always the same. The composition of mixtures can vary.