Elements are identified based on their absorption spectra. Every element absorbs a unique set of frequencies when light passes through it. Scientists can determine which elements are present based on which portions of the star's light are absorbed.
Studying Fraunhofer lines helps to identify elements on the stars.
Classify stars and to understand how stars change over time
Yes, they are.
Constellations are simply pattern of stars that with a little imagination, resemble objects, people or animals. You don't need anything to identify them other then your eyes and a little imagination.
Astronomers.
Frequency or wavelength is used in the spectrum of astronomical objects in order to identify which chemical elements are present in the stars.
astronomy
Astronomers
What elements the star is made of.
Studying Fraunhofer lines helps to identify elements on the stars.
Classify stars and to understand how stars change over time
Chemists deal with the table of elements and the universe contains these elements. Astronomers study space and the planets stars and whatever else is in space contains these elements. Chemistry helped the U.S. to be the first to the moon.
Yes, they are.
Constellations are simply pattern of stars that with a little imagination, resemble objects, people or animals. You don't need anything to identify them other then your eyes and a little imagination.
Stars...
Astronomers classify stars.
Because the spectrum consist of another element