this post was submitted on 08 Aug 2024
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Science Memes

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submitted 3 months ago by [email protected] to c/[email protected]
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[–] [email protected] 51 points 3 months ago (5 children)

Moon would "disappear" when it no longer reflected Sun's light.

It would also start getting very cold fast

[–] [email protected] 18 points 3 months ago

It would probably take more than a day for the cold to be so intense that you can't possibly explain with some normal local phenomenon.

[–] [email protected] 14 points 3 months ago

The moon might be on the daylight side, so we wouldn't necessarily observe that.

[–] [email protected] 12 points 3 months ago (1 children)

Any visible planet or asteroid would. So some stars would also appear to blink out, but those would take longer to blink out. So the moon would go after 8 minutes, Jupiter would take 43 minutes to stop receiving light, and another 35-52 minutes to disappear for earth depending on orbital locations.

Presumably we would get something on radio/tv/internet from the side facing the sun once they realized it, that of course being only if they hadn't already been eradicated by a horrific shockwave caused by whatever event caused the sun to vanish before they had a chance to report what they saw, because supernovae tend to travel at very close to the speed of light, so there wouldn't be much time for them to react.

And if this is a supernova, you might just have time to grok what happened before the planet was obliterated under your feet from the shockwave.

So I guess... chances are we would just barely understand what happened before we were gone.

[–] [email protected] 4 points 3 months ago* (last edited 3 months ago)

It’s kind of odd that it doesn’t matter for a single human whether they die from sudden car accident or get obliterated by supernova. Both events feel equal

[–] [email protected] 6 points 3 months ago (4 children)

Does heat travel at the speed of light? I just realized I have no idea how the heat from the sun travels to earth.

[–] ironhydroxide 31 points 3 months ago

The "heat" IS the radiation. So, yes.

[–] [email protected] 13 points 3 months ago (2 children)

Someone correct me if I'm missing some nuance here, but heat doesn't get transferred directly through space because heat is vibrating molecules and space is a vacuum. The sun radiates (speed O' light). A lot of that radiation just reflects off the earth (or we wouldn't be able to see it), but a lot of it gets absorbed. THAT's when it's converted into heat energy. It's also why the greenhouse effect is a global phenomena: light energy comes in across the vacuum relatively easily, turns to heat on Earth instead of being reflected, heat energy cannot escape as easily as light energy.

[–] [email protected] 4 points 3 months ago

Neat! Thanks for sharing.

[–] [email protected] 4 points 3 months ago

Infrared light is absorbed quite easily, producing heat, and the sun emits a lot of it. Of course, all photons that are absorbed and not reflected will produce thermal energy, and infrared radiation is commonly referred to as radiant heat. The other two heat transfer methods are conduction and convection, which requires a medium to transfer through.

[–] [email protected] 6 points 3 months ago (1 children)

When there is a total solar eclipse, the temperature does drop dramatically. But it might not be detectable on the other side right away for sure.

[–] [email protected] 3 points 3 months ago

It does! And if you're in a place where night animals are noisy, they get noisy for the length of "dusk", totality, and "dawn"!

[–] [email protected] 2 points 3 months ago

Yes, we have conduction, convection, and radiative heat transfer. Vacuum insulates the first two, it's the light from the sun that heats us up

[–] [email protected] 4 points 3 months ago (1 children)

I wonder how cold how fast.

[–] WolfLink 11 points 3 months ago

It wouldn’t really be faster than normal nighttime cooling. However, that cooling would continue instead of having the sun to start warming stuff up in the morning.