The Coldest Places in the Universe......Part 1....Cold planets & Dead Stars
The Coldest Places in Space Maybe Closer Than You Think!
The Coldest Places in the Solar System
The Sun is the main source of energy that heats the planets, moons and asteroids with electromagentic radiation, which is light.
The further away you move from the Sun the less energy the body recieves, and in fact we say that the intensity decreases with distance squared, as you can see in the equation below. Where Luminosity is just a way of say how much the energy the Sun gives at the surface.
We'll start with the furthest planet from the Sun, well it's not a Planet but let's use it for example. Pluto has surface temperatures of 33 to 44 Kelvin or -230 Celcius, now that's pretty cold as far as cold gets. It's going to get colder.
The coldest thing in our "close" solar system is actually the moon. NASA scientists have discovered that there are craters on the south pole of the Moon that stay at a constant temperature of -240 Celcius. Due to orbit of the Moon with respect to the Earth and Sun, the South Pole hardly ever recieves any light, so will not heat.
The Kupier Belt is the name given the very edge of the Solar System. So you'd assume this would probably top the list but infact the surface tempertures of the objects in the Kupier belt have been measured to be about -220 Celcius, which is slightly warmer than the Sun.
So the Moon, according to scientists seems the be the coldest place in the Solar System.
Well in terms of cosmic bodies..........
Dead Stars
When small stars can longer fuse Hydrogen into Helium the stars go through a process of death. For something like the Sun or smaller then at first it expands and becomes a Red Giant, the remains are somthing called a White Dwarf which is literally a very very hot Diamond; in fact Diamonds are probably the most common material in the Universe. The White Dwarf radiates it's heat untill eventually cooling to be a Brown Dwarf. In April 2014, WISE 0855−0714, a Brown Dwarfs called a "Y Dwarf" have been found to be as cold as -50 Celcius, that is the coldest record we have of a star as far as I am aware.
By chance it's hypothesised that some of these dwarf cold have died billions of years ago and were ejeceted from thier Galaxy. Over time, by Laws of Thermal Dynamics it would radiate it's heat away and probably be quite cold.
Next time I will talk about Vacuum of Space, Cosmic Microwave Background Radiation, and Black body.
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Content Source:-
Pluto
Moon
Kupier Belt
Picture sources:-
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