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exploding fireflies


Fireflies live for anything from one minute to two days. In this time they change their brightness and their size.


This graph shows how the brightness of the X-rays from one firefly changed with time.


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Quick Quiz!
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Before the firefly "lights up", a low brightness of around 10,000 counts is measured. Then the firefly slowly gets brighter and begins to glow, brighter and brighter, until towards the end of its life it gets really bright and explodes! Make Eric, the firefly, glow by rolling over the scale on the animation below.





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