That's done by analyzing the star's spectrum.
the colors of light it gives off.
By the star's continuous spectrum.
it determines their composition and age and direction of shift
A spectrograph is an instrument for chemical analysis.
Spectroscopic analysis of the light emitted by the star.
The chemical formula is determined by chemical analysis of the components.
similar age and composition.
Yes, the composition of a star can be determined by analysis of its color, which would be described scientifically as spectrographic analysis.
it determines their composition and age and direction of shift
It is used to analyse the state and composition of a distant star's light as it arrive on Earth.
A telescope, whose light output would be sent through a spectral analysis machine of some type. That analysis of the emission spectra of the star would be compared to the known spectra of the elements to find the composition of the star.
The composition is determined by spectral analysis.
karyotype analysis
Spectral analysis.
Leonard W. Aurand has written: 'Food composition and analysis' -- subject(s): Analysis, Composition, Food
I need SWOT analysis and PESTAL analysis of BLUE STAR LIMITED
The composition of inks is determined.
This is proved by chemical analysis.
the lines in its spectrum