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  the wings of a firefly
  how big are fireflies?
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  how hot and dense are fireflies?
  what have we learnt about fireflies?

how hot and dense are fireflies?


Fireflies are very hot indeed. They can reach temperatures of several million degrees. That's much hotter than anything that occurs naturally on Earth.

... and how dense are they?
Much less dense than the air we breathe is the short answer - by a long way!  X-ray bright points are one hundred million times less dense than the air we breathe. Even so, they are more dense than their surroundings in the Sun's atmosphere.


The picture below uses false colour to show different temperatures. The hottest parts are shown as red and the coldest as blue.






You can tell how many particles are packed together from the colours in the picture above. As with the temperature picture (left), false colours are used. Areas shown in red have the fewest particles and areas shown in pale yellow or white have the most.




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