Portal:Radiation astronomy/Pictures/10

On the right is the visual image of the constellation Orion. On the left is Orion as seen in X-rays only. Betelgeuse is easily seen above the three stars of Orion's belt on the right. The X-ray colors represent the temperature of the X-ray emission from each star: hot stars are blue-white and cooler stars are yellow-red. The brightest object in the optical image is the full moon, which is also in the X-ray image. Credit: Konrad Denner/Wolfgang Voges. The X-ray image was actually obtained by the ROSAT satellite during the All-Sky Survey phase in 1990-1991.