Comment on But I am mighty!!

saltesc@lemmy.world ⁨2⁩ ⁨months⁩ ago

• Chrobin@discuss.tchncs.de ⁨2⁩ ⁨months⁩ ago

  Actually,

  There’s no fire in the sun. Fire is some material oxidizing, and that’s not what’s happening (or at least not in relevant amounts). What creates the radiation is nuclear fusion.

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  • saltesc@lemmy.world ⁨2⁩ ⁨months⁩ ago

    youtu.be/sLkGSV9WDMA

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• xavier666@lemm.ee ⁨2⁩ ⁨months⁩ ago

  Hypothetically speaking, will you get sunburnt if you sit near a fire all day?

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  • krashmo@lemmy.world ⁨2⁩ ⁨months⁩ ago

    The heat could dry out your skin, which, if I’m not mistaken, is essentially what a burn is. However, as the other person noted, a sunburn is damage from radiation, not heat. So I think you could stretch the common definition of a burn to call heat induced dry skin a burn but calling it a sunburn would not be accurate.

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    • TauZero@mander.xyz ⁨2⁩ ⁨months⁩ ago

      @xavier666@lemm.ee If you sit at a magnesium fire, it burns at 3300K, which is hot enough to produce sizeable ultraviolet rays. So you can get your sunburn from that, damaging the DNA in whatever of your remaining cells have not been melted away by heat.

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      • xavier666@lemm.ee ⁨2⁩ ⁨months⁩ ago

        Note to self - Don’t sit near a magnesium fireplace if you don’t want to tan your bones, which are exposed by the flesh getting melted off by the said fireplace.

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    • chatokun@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

      Heat is also (thermal) radiation. So is light, radio waves, microwaves, etc. However, the radiation from a fire or the other stuff I mentioned isn’t ionizing, so unless the heat itself does damage it won’t do cellular damage.

      You also give off thermal radiation, but so does anything higher temp than absolute zero.

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    • xavier666@lemm.ee ⁨2⁩ ⁨months⁩ ago

      Thanks. I completely forgot that the standard suntan or sunburn is caused by UV rays. A fireplace doesn’t create UV rays.

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  • twice_hatch@midwest.social ⁨2⁩ ⁨months⁩ ago

    Maybe! en.wikipedia.org/wiki/Erythema_ab_igne

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• AES_Enjoyer@reddthat.com ⁨2⁩ ⁨months⁩ ago

  Why exactly do you think there is UV radiation coming from the sun?

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  • LH0ezVT@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

    Because the spectrometer says so, mainly. Why?

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    • AES_Enjoyer@reddthat.com ⁨2⁩ ⁨months⁩ ago

      Hahaha that’s a good one

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  • NikkiDimes@lemmy.world ⁨2⁩ ⁨months⁩ ago

    The nuclear reactions occurring within the sun emit a wide spectrum of radiation, everything from sub-visible thermal radiation to high energy gamma rays. Thankfully, the Earth’s own electromagnetic field and ozone protects us from all but a tiny sliver of ionizing radiation or we wouldn’t be here to talk about it.

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    • AES_Enjoyer@reddthat.com ⁨2⁩ ⁨months⁩ ago

      Isn’t most of that radiation blocked by the outer layers of the sun, though? Like, sure, there is a non-negligible amount of high energy photons escaping, but the overwhelming majority of the radiation comes AFAIK from blackbody radiation from the plasma at the temperature of the surface of the sun?

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• NikkiDimes@lemmy.world ⁨2⁩ ⁨months⁩ ago

  A ball of constant unending nuclear explosion

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