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# What is the coldest place in the solar system?

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Space is very, very cold. The baseline temperature of outer space is 2.7 kelvins — minus 454.81 degrees Fahrenheit, or minus 270.45 degrees Celsius — meaning it is barely above absolute zero, the point at which molecular motion stops.

But this temperature is not constant throughout the solar system. So-called "empty" space — though it is not actually empty — is far colder than planets, moons or asteroids, for example, because there is (practically) nothing to absorb the energy coming from the sun.

So, not including regular "empty" space, what is the coldest place in the solar system? And how does it compare with temperatures on Earth?.

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I always thought it was weird that the surface of earth is warm, but the closer you get to the sun, the colder it gets.

How close do you have to get to the sun before space starts warming up?

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12 minutes ago, Alex_Rogan said:

I always thought it was weird that the surface of earth is warm, but the closer you get to the sun, the colder it gets.

How close do you have to get to the sun before space starts warming up?

You'd have to be about 3 million miles away to feel space heated by the sun. Of course, the solar radiation would have made you long since dead before you could get there.

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15 minutes ago, Occupational Hubris said:

You'd have to be about 3 million miles away to feel space heated by the sun. Of course, the solar radiation would have made you long since dead before you could get there.

I'm still left wondering how far from the earths surface you'd have to go before things started warming up.

Just beyond the atmosphere?

What exactly does the sun radiate? Particles and such?

What exactly is the sun? A plasma ball?

I suppose the heat from the sun is different than heat from a fire.

In order for heat from the sun to occur, it has to be absorbed by a surface?

All in all, it gives me something to think about and research. I don't really expect answers to these dumb questions.

It helps me keep my mind from the troubles of the world. Thanks.

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Just now, Alex_Rogan said:

I'm still left wondering how far from the earths surface you'd have to go before things started warming up.

90 million miles, because you would need to be within 3 million miles of the sun.

Just now, Alex_Rogan said:

Just beyond the atmosphere?

90 million miles

Just now, Alex_Rogan said:

What exactly does the sun radiate? Particles and such?

Visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Everything is particles

Just now, Alex_Rogan said:

What exactly is the sun? A plasma ball?

Hot plasma that's fueled by nuclear fusion reactions

Just now, Alex_Rogan said:

I suppose the heat from the sun is different than heat from a fire.

Heat is just electromagnetic radiation regardless of the source

Just now, Alex_Rogan said:

In order for heat from the sun to occur, it has to be absorbed by a surface?

It has to come in contact with something, yes

Just now, Alex_Rogan said:

All in all, it gives me something to think about and research. I don't really expect answers to these dumb questions.

It helps me keep my mind from the troubles of the world. Thanks.

I mean, you could just look up "The Sun" on Wikipedia.

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10 minutes ago, Occupational Hubris said:

I mean, you could just look up "The Sun" on Wikipedia.

Ha. That's where I started, probably while you were responding. I appreciate your answers. Pretty cool. Thank you.

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1 hour ago, Alex_Rogan said:

I'm still left wondering how far from the earths surface you'd have to go before things started warming up.

Just beyond the atmosphere?

What exactly does the sun radiate? Particles and such?

What exactly is the sun? A plasma ball?

I suppose the heat from the sun is different than heat from a fire.

In order for heat from the sun to occur, it has to be absorbed by a surface?

All in all, it gives me something to think about and research. I don't really expect answers to these dumb questions.

It helps me keep my mind from the troubles of the world. Thanks.

Hubris already covered your questions, I would just like to add, the only DUMB question is the one you don’t ask nothing you have said throughout this thread is dumb my friend!

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1 hour ago, Occupational Hubris said:

90 million miles, because you would need to be within 3 million miles of the sun.

90 million miles

Visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Everything is particles

Hot plasma that's fueled by nuclear fusion reactions

Heat is just electromagnetic radiation regardless of the source

It has to come in contact with something, yes

I mean, you could just look up "The Sun" on Wikipedia.

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The coldest place in the universe are my mother in laws eyes. No doubt about it.

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1 hour ago, jethrofloyd said:

The coldest place in the universe are my mother in laws eyes. No doubt about it.

That frightening as hell dude.