I believe this is called magnitude, or apparent magnitude.
Scientists use color, size, brightness, and temperature to classify stars.
their genome
The chart is a dichotomous key. It helps them classify things.
Stars are classified by four different characteristics. Apparent magnitude (brightness) and absolute magnitude (how bright it would appear at 10 parsecs from the earth). Luminosity, another measure of brightness, compares the star to the sun's brightness. Spectral classifications are measured by the star's temperatures. Finally stars are signed a number by scientists through the Morgan-Keenan System.
Scientists classify organisms by the dichotomous key. They classify by looking at if it moves or not, then they look at characteristics, then they can see what they are.
Radial symmetry
scientists classify organisms into groups based on internal and external features.
DNA is the answer.
by the way they look and act
Scientists use the periodic table to classify the elements. The elements are arranged in the table based on their atomic number, electron configuration, and chemical properties. This organization helps scientists identify patterns and relationships among the elements.
scientists classify Mount Kilauea as a shield volcano
Taxonomy