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Does the Sun contain fire? Or some pure form of energy?

If space has no air how can fire exist there? It may exist cause a burning piece of magnesium keeps on burning in vacuum but, to start fire, oxygen is required.

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    $\begingroup$ The sun is not made of fire (a result of oxygenation), it is made of hydrogen plasma. $\endgroup$ – Kyle Kanos Apr 4 '14 at 13:34
  • $\begingroup$ kyle sir,it is also a form of energy ,isnt it?so,can a. form of energy exist in vacuum?This was my actual question $\endgroup$ – dipendra Apr 4 '14 at 13:42
  • $\begingroup$ Hydrogen is not energy, it is an atom. The sun produces energy through hydrogen fusion, which releases photons (energy). $\endgroup$ – Kyle Kanos Apr 4 '14 at 13:47
  • $\begingroup$ And since space is not a vacuum, I don't see what the issue is. $\endgroup$ – Kyle Kanos Apr 4 '14 at 13:48
  • $\begingroup$ Thank you sir,if space is not vacuum,which gas is found? $\endgroup$ – dipendra Apr 4 '14 at 13:54
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It depends on what you call a medium; I assume you refer to matter as a medium.

Then, roughly speaking: yes, there is radiation, like light, or heat radiation, that can exist without matter as medium. I think you could call this "energy" in this sense.
You can transfer light through a vacuum, of course.

The sun, fire or burning magnesium are about matter that is hot - which is very different.

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Like a rocket provides oxygen to burn fuel in space, so the sun provides its own energy. Like you, I'm not necessarily convinced the space in an of itself it not a medium since light travels at a constant speed within it and matter is capable of traveling within it. Planets bleed their own atmospheres into space as well.

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