produced by the largest, hottest stars.
They are also used to trace the
remnants of supernova explosions
such as neutron stars and black holes.
 ultraviolet: With wavelengths
slightly shorter than those of visible
light, ultraviolet rays are fairly
energetic and can be harmful to
humans. Only a fraction of the
ultraviolet rays that reach our planet
penetrate the atmosphere to ground
level.
 visible (optical) light: The small
portion of the electromagnetic
spectrum sensitive to such a narrow
range of wavelengths, stars like the