This stunning shot was taken with an enhanced Hubble telescope camera. It depicts a plot in the constellation Sagittarius (Archer). This part is incredibly detailed. The frame is completely filled with dark red and bright blue stars located throughout the photograph against the background of many distant galaxies. First of all, two points become noticeable: colors, as well as spectacular crosses, born from the centers of the brightest objects.
In the process of formatting the pictures, their glow was saturated and made more clear. But in reality, each star has its own color. Their color depends on the surface temperature: hot objects are blue or white, and cold objects are red. Their temperature may be lower because they are smaller in size or because their age approaches transformation into a red giant (the old star rises, after which its temperature drops sharply due to the destruction of the nucleus). Crosses have nothing to do with the stars themselves. And since Hubble rotates above the earth's atmosphere, there is no interference with it when shooting. These features are known as diffraction peaks and are due to the structure of the telescope itself. Like all bulky tools, Hubble uses mirrors to capture the light and shapes of images. Its secondary mirror is mounted on struts, called telescopic spiders. They are located in the transverse formation and scatter the light entering there. Diffraction is a slight curvature of light when it passes near the edge of an object. Each cross in the photo is created with one set of Hubble internal struts! Despite the fact that these nuances reflect only a technical flaw, many photographers choose them to surprise with the incredible beauty of the images.