عنوان مقاله [English]
نویسنده [English]چکیده [English]
At first look it seems that the color of starts is of no consequence, but these colors are indeed very meaningful. They show the temperature of the surface of stars and sometimes the state of their atmosphere as well. The temperature of the surface of stars contain implications about conditions of their depths, and can help us measure related distances. The color can also reveal the position of a star in its group.
Modern technology has opened a new window to the universe, and has made precise observation of stars possible.
The new method provided by photography has led us to new ideas about stars and galaxies and has given a new life to the science of star photometry. There are serious contradictions between the measurements of quality and quantity of stars’ light based on records and what can be seen in images.