- energy that is given out by atoms at high speed is called radiation – two main forms; atomic particles and electromagnetic radiation.
- electromagnetic radiation that either travels as waves or as tiny particles called photons (see light)
- radioactivity – atom decays (break down) to send out gamma rays and particles.
- nuclear radiation – generated by atomic bombs and nuclear power station.
- electromagnetic radiation – electric and magnetic fields that move in tiny bursts of waves or photons.
- There are different kinds of electromagnetic radiation; each with different wavelengths.
- gamma rays – very short wave; energetic and dangerous form of electromagnetic radiation.
- visible light – only part of the electromagnetic spectrum that can be seen with the human eye.
- radio waves – low energy radiation.
- in between gamma rays and radio waves are X-rays, ultraviolet rays, visible light, infrared rays and microwaves.
- together above these forms of electromagnetic radiation are called the electromagnetic spectrum.
- all electromagnetic rays move at the speed of light – 186,282 miles per second!
- everything that can be detected in space is picked up by the radiation that it gives out.
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