Are red stars cold

Answer 1

The sun is a massive fusion engine, which gives off its heat by radiating it into space. We call the fusion processes stellar nucleosynthesis. The nuclear fusion reactions produce zillions of watts of heat. It's about 383 billion billion megawatts, which is 3.83×1026 W, and it does that every second. That's a lot of energy. Use the link below to read about the sun in the Wikipedia post. And if you're feeling brave, use the other one to the post on the fusion process itself. You'll be measurably smarter if you read all of that article!

Answer 2

At its center, the sun has a density of over 100 times that of water, a temperature of 10 to 20 million degrees Celsius, and a pressure of over 1 billion atmospheres. By contrast, the surface of the Sun is close to 5,785 kelvins (1/2350th of the core).

• Thompson, M. J. (2004), Solar interior: Helioseismology and the Sun's interior, Astronomy & Geophysics, v. 45, p. 4.21-4.25
• T. J. White; M. A. Mainster; P. W. Wilson; and J. H. Tips, Chorioretinal temperature increases from solar observation, Bulletin of Mathematical Biophysics 33, 1-17 (1971)

Answer Lets put this into perspective....if the earth was only a mile closer to the sun, then we would not survive the heat. Answer Not true at all.... The Earth's orbit varies by as much as 2 million miles towards and away from the sun each and every year, so the above is totally bogus. We average 93 million miles away. The sun is very hot, anywhere from tens of thousands of degrees Fahrenheit at the surface, to millions of degrees in the core. For perspective; your oven and stove top range only make it to about 500 degrees or so.

Answer 3

Not really. Well, there are brown dwarves, which are too small to have nuclear fusion, but those don't really qualify as a "star". On the other hand, a white dwarf will eventually cool down and become a "black dwarf", but it will take many trillions of years for that to happen, and the Universe isn't yet old enough for there to be any black dwarves.

Answer 4

Technically, no.

Burning is a chemical reaction where chemical bonds are broken to release energy. The sun is powered by a nuclear fusion reaction. These generate tremendous amounts of energy, and that energy then heats the particles in the sun (and on its surface) to plasma level, causes them to emit light.

Answer 5

Yes, the sun is hotter than fire. Temperatures in the sun range from 10,000 degrees Fahrenheit to about 27 million.

Most fires have temperatures ranging from a few hundred degrees, in some cases a few thousand.

Answer 6

The sun is a very hot star.

Relatively however it is mid range. It burns at 5800 Kelvin (5530 Celsius).

Stars on the main-sequence stage of their stellar evolution are within the range of 0.2Ms and 30Ms (where Ms is the mass of our sun.) and burn at different temperatures depending on their size. With the larger stars surface temperature burning at an exponentially hotter temperature.

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Answer 7

Basically there is no such thing as a "cold star". At least, stars are definitely not cold compared to our everyday experience. A typical star has a surface temperature of at least several thousand kelvin. For comparison, the environmental temperature here on Earth is typically around 300 kelvin.

Wikipedia lists Betelgeuse's surface temperature as 3,140-3,641 kelvin; I believe the range of temperatures is due to the fact that it is a variable star. This is quite a bit "colder" than our Sun; on the other hand, being a giant star, it has a huge surface, so it radiates a lot of energy: Wikipedia also lists its "luminosity" - basically, the amount of energy it radiates - as 120,000±30,000 times as much as our Sun.

Answer 8

That depends on the type of star. Red dwarves are quite a bit colder than our Sun (but still hot compared to our everyday experience - a few thousand degrees). White dwarves, on the other hand, are stars that are burnt out, but that are much hotter than our Sun (at least, their surface temperature is much hotter), because they still have lots of residual heat left.

Answer 9

Not from the usual point of view of 'freezing' on earth. And I don't think there are any substances at all that have a melting point higher than the temperature of any part of the sun.

Answer 10

No. They emit less energy so they cooler than other stars, but they are still quite hot by human standards.