Light from astronomical objects comes in a wide range of colors,
each corresponding to a particular kind of electromagnetic wave.
Hubble can detect all the visible
wavelengths of light plus many more that are invisible to
human eyes, such as ultraviolet and infrared light.
Astronomical objects often look different in these different
wavelengths of light. To record what an object looks like at a
certain wavelength, Hubble uses special filters that allow only
a certain range of light wavelengths through. Once the unwanted
light has been filtered out, the remaining light is recorded.