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X-rays
are very high frequency waves, and carry a lot of energy.
They will pass through most substances, and this makes them
useful in medicine and industry to see inside things.
X-rays
are given off by stars,
and strongly by some types of nebula.
An X-ray
machine works by firing a beam of electrons at
a "target". If we fire the electrons with enough
energy, X-rays will be produced.

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