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    ESA > Our Activities > Human and Robotic Exploration > Lessons online

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    What is radiation?

    Radiation is the term used for all phenomena characterised by the transport of energy, either by waves or sub-atomic particles. The highest energy waves can behave just like particles, and sub-atomic particles can behave just like waves. This is called the wave – particle duality.

    For more information on different aspects of radiation click on the right-hand links to:

    • the electomagnetic spectrum
    • particle radiation: radioactivity and cosmic rays
    • the effects of magnetic fields
    • radiation and life

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