Seeing the Universe
Photons, in fact, are light-and all the different kinds of radiation we mentioned are in reality just photons with different energies.
Different temperatures and environments typically produce photons with different energies.
X-rays, for example, get made when temperatures are very high, millions of degrees, and gravity is very strong...
Scientists think of light as a stream of particles with specific energies, but photons in fact behave both as particles and as waves.
So they can also be described in terms of the distance between the crests of each wave... and that's called "wavelength."
Let's step through the spectrum and see how energies change, resulting in the different kinds of radiation.
Electromagnetic Spectrum
Imagine the Universe
Electromagnetic Spectrum
Interactive Multimedia Adventures for Grade-school Education Using Remote Sensing (IMAGERS)
NASA's Observatorium
All these different kinds of radiation begin down in the sub-atomic world when an electron, depicted here in yellow, hits a proton, blue, or suddenly changes direction... and releases a bundle of energy known as a "photon"-those glowing bursts of energy.
And the different energies need diffferent detectors to see them.
The electromagnetic spectrum explained in simple terms using real-life examples.
An introduction on the electromagnetic spectrum including why we need to go into space to see the entire spectrum.
This site explains each type of electromagnetic radiation, its uses and the dangers from too much exposure to the radiation.
A simple explanation of electromagnetic radiation including each type of radiation, how we "see" using that type of radiation and what that type of radiation shows us.
An introduction to the electromagnetic spectrum.