Hubble's many filters allow it to record images in a variety
of wavelengths of light. Since the cameras can detect light outside
the visible light spectrum, the use of filters allows scientists
to study "invisible" features of objects — those
only visible in ultraviolet and infrared wavelengths.
In the example to the left, galaxy NGC 1512 is represented in
several different wavelengths. Hubble isolates these specific
wavelengths using special filters. Choosing a particular filter
reveals an image of the galaxy taken through that filter —
that is, in a specific wavelength range. The finished image at
the far left is actually a combination of all the filtered images.