Is The Universe Truly Cold? The Real Temperature In Space

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Despite the fact that sci-fi movies make it seem as though outer space is a very cold — or even freezing — place, it isn’t. As a matter of fact, it doesn’t even have a temperature.

Heat is the amount of energy a particle has, and temperature is the rate at which that particle is traveling. So there would be no particles or radiation in a fully empty area of space, and as a result, no temperature.

Particles and radiation in space create heat and temperature, as you would expect. So, how cold is space? Is there an area of space that is genuinely empty, and is there a temperature that lowers to absolute zero? Nuclear fusion may begin very instantly in the areas of space immediately around stars, which contain all of the necessary ingredients.

Multiple temperatures

When the radiation from a star enters a region of space where there are many particles, it heats up rapidly. As a result, radiation from stars such as the sun has something to work with.

Our planet is much warmer than the area between our star and our planet’s surface. When solar energy strikes particles in our atmosphere, they vibrate, transferring their energy to the rest of us via collisions.

However, proximity to our star and the presence of particles does not imply warmth. Temperatures on Mercury, which is nearest to the sun, range from sweltering during the day to icy at night. 95 Kelvins (-288 0 Fahrenheit/-178 0Celsius) is its lowest temperature.
In comparison to Neptune, Uranus’ surface temperature drops to -371 F (-224 C), making it even cooler than Neptune’s -353 F (-214 C) temperature.

Uranus’ inability to retain its internal heat is the consequence of an encounter with an Earth-sized object early in its history, which caused Uranus to circle the sun with an extremely tilted orbit.

It is hard to transmit heat by any other means than radiation when you’re far from the stars, therefore temperatures plummet. The interstellar medium is the name given to this area.

Interstellar molecular gas clouds may reach temperatures of 10 K (-505 0F/-263 0C or) for the coldest and densest particles, and 100 K (-279 0F/-173 0C or) for the warmest.

One consistent temperature

This vastness and diversity of things, some scorchingly hot and others almost inconceivably cold, make it impossible to assign a single temperature to the whole cosmos.

However, there is something whose temperature is consistent across our universe down to one part in 100,000. As a matter of fact, the temperature difference between a hot and cold region is about 0.000018 K.