Post #444

When it comes to NASA Hubble, filters are a must for the vivid, colorful images we love to see. Hubble's cameras capture a wide range of wavelengths, visible and invisible, giving scientists information beyond what we could see with our eyes. Color images are created with the help of filters that only let light from specific wavelengths pass through. For example, in this image of barred spiral galaxy NGC 1097, a filter at the 555-nanometer wavelength lets green light pass through. Filters yield a grayscale image showing only the amount of light with that wavelength, allowing astronomers to add color when processing the image.