That is usually calculated on the basis of the diameter, using the formula for a sphere, since stars are usually spherical to a good approximation.
The color of a star provides a measure of its temperature.
The brightness of a star.
The measure of a star's brightness is its magnitude. A star's brightness as it appears from Earth is called its Apparent Magnitude.Star's brightness is measured by there magnitude.
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A star's luminosity is the measure of the total energy radiated by the star in one second.
The measure of area is Lebesgue measure on the plane.
photographs use to measure the brightness of a star
use measure of area
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
The luminosity of a star is related to its intrinsic brightness, which is determined by its temperature and surface area. The Stefan-Boltzmann Law states that a star's luminosity is proportional to the fourth power of its temperature (in Kelvin) multiplied by its surface area. This relationship helps astronomers classify stars and understand their lifecycle stages. By comparing luminosity with distance, astronomers can also measure a star's absolute magnitude.
Square metres measure an area. For example, the area of a room measuring 24 metres x 18 metres = 432 square metres.
Area = base * height(height being the vertical measure, not the sloped measure)Area = base * height(height being the vertical measure, not the sloped measure)