You can determine what a star is made of by close examination of the light that it emits. Every different substance emits a different combination of light frequencies when it is heated to the point at which it glows. You can pass light through a prism and break it up into its component frequencies (or colors) and analyse them in great detail, with the right kind of equipment and training.
how dense the star is
Instruments such as a sextant or a quadrant can be used to determine the altitude of the North Star. By measuring the angle between the North Star and the horizon, navigators can determine their latitude.
distance from the sun and the age of the star
The spectrum of a star provides information about its temperature, composition, and motion. By analyzing the spectrum, astronomers can determine the star's chemical makeup, age, and even whether it is moving toward or away from Earth.
To determine a star's luminosity, one can measure its apparent brightness as seen from Earth and correct for distance. Using this information along with the star's surface temperature, one can apply the Stefan-Boltzmann law to calculate the star's luminosity. This process allows astronomers to compare the intrinsic brightness of stars regardless of their distance from Earth.
You can determine star of a star planet by its color also you can determine its temperature by its color by:Joshua R. Dapitillo thanks=)
It isn't clear what you want to determine about the star.
Mass
By the star's spectrum.
how dense the star is
Instruments such as a sextant or a quadrant can be used to determine the altitude of the North Star. By measuring the angle between the North Star and the horizon, navigators can determine their latitude.
Our Sun is about 70% Hydrogen and 28% Helium by mass, with traces of heavier elements. Other stars can be a little different, but with a spectrometer, scientists are able to determine the elements that are present in any star.
temperature
yes sometimes
its color does determine the temperature of star.
To determine your direction using the North Star, locate the North Star in the night sky, which is always positioned in the north. By facing the North Star, you will be facing true north, helping you find your direction.
Sextant.