Large balls of gas emitting energy in the form of light. I apologize I'm not good at science, but this is just a guess.
Because of the greenhouse effect.
Scientists use color, size, brightness, and temperature to classify stars.
size
you classify stars by color, temperature, size, composition, and brightness.
they are the color, brightness, what its made of
Three characteristics to classify stars are their luminosity, size, and color or surface temperature.
In Astronomy stars can be classified by theircolor (temperature)composition (as found by their spectrum)agelocation in a galaxymassproximity to other stars
age, brightness , color, bubblyness, yellowness , and heet
because it would be hq3ui5qth5uitqe4hy
---- 1. color 2.size 3.brightness 4.compostion 5.temperature .
Astronomers classify stars.
A classification system organizes items into different groups based on their shared characteristics, making it easier to classify and identify them. For example, in biology, species are classified into different taxonomic categories based on their physical traits and genetic relationships.