I don't know if this is THE four ways, but here are four possible ways:
Temperature/Color (amounts to the same thing)
Size
Population ("metallicity" is essentially a different description of pretty much the same thing)
Mass
What are some ways the stars in the photo could be grouped or classified
Two ways are by temperature and brightness
spectrum and temperature
I don't know if this is THE four ways, but here are four possible ways:Temperature/Color (amounts to the same thing)SizePopulation ("metallicity" is essentially a different description of pretty much the same thing)Mass
Stars are classified based on their spectral characteristics, which categorizes them into spectral types (O, B, A, F, G, K, M) based on the temperature of their surface. They are also classified based on their luminosity, which categorizes them into different classes (I, II, III, IV, V) based on their brightness compared to the Sun.
The four types of stars are; Main Sequence, White Swarfs, Red Giants and Super Giants. 90% of stars are in the Main Sequence.
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There are four ways to classify a mineral:They have a crystal structureThey are formed in natureThey have a definite chemical makeupThey are a solid
Protostar formation - The Birth of a starMain sequence - When it converts hydrogen into energyPost main Sequence - When they die.
By spectral type: Stars can be classified based on their spectral characteristics, which provides information about their temperature, color, and composition. By luminosity: Stars can be categorized by their brightness, which can vary greatly based on their size and energy output. By evolutionary stage: Stars can be classified based on where they are in their life cycle, such as main sequence stars, red giants, white dwarfs, etc.
They are usually classified by their temperature.
Using the sun moon and stars