Orion, c 2000.
© National Aeronautics & Space Administration / Science & Society
Combined image of the grand stellar nursery known as the Orion Nebula taken through three separate filters, each designed to record different emission lines - light from sulphur, oxygen, and hydrogen atoms glowing in the tenuous nebular gas. In this image, sulphur is red, hydrogen is green, and oxygen is blue, a colour scheme used in images of other astronomical nebulae as well. While very different from what the eye sees, the image is still both beautiful and scientifically valuable, tracing elements and conditions within the nearby star-forming region.