When we refer to outer space, the first thing that comes to mind is extreme cold, largely due to movies that feature this factor in their plots. butDoHow cool space really is? More importantly, why is it so cold? To understand this, we have to take a look look at me Thermodynamics according to Harvard University.
Outer space in Most EmptyHe has a temperThe height varies according to the regions and objects present. Space is massive, and between stars and galaxies the temperature is relatively low. In interstellar space, the temperature can be around 3 Kelvin (-270.15 °C), This is mainly due to radiation Be microwave background (WBC), residue big Explosion Which is present throughout the universe.
So how can space be so cold?
You can find the answer in nature The same emptiness. in Absence of matterThere are no molecules colliding with each other and generating heat, he himself said so Break the sleeve Crespo. In addition, thermal radiation is dispersed into space, making heat transfer very inefficient. This means that any object in outer space will lose heat and cool quickly until it reaches… Low temperature.
It is important to note that despite these low temperatures, space is not completely devoid of heat. the starsthe Planets And other bodies heavenly Emitting Thermal radiation Also due to internal temperatures. For example, Surface Follower sun Its temperature is approx 5500°CWhich means that it emits a large amount of heat to the surrounding space. However, this radiation Thermal It disperses quickly as it moves away from the emitting object, which helps preserve… Regions Interstellar state Extreme cold.
In addition to radiation ThermalAnd there are others Processes physical In space which can affect Temperature local. For example, star formation and activity Holes black can be born Intense fields Magnetic And flows grains to high energyWhich can warm the surrounding areas. These phenomena are strongest in regions with a high population density of galaxies and galaxy clusters, where interaction gravity The stars are more active.
If an astronaut took off his helmet in outer space, he would be exposed to a variety of dangers, including… This is solar and cosmic radiationAs well as lack of oxygen and lack of pressure Atmosphere. Background radiation Microwave (CMB)) would not be the main risk in this case. So don't worry about freezing right away, Space is not like that As cool as some movies are and worse, that's not the only thing you have to worry about, there is Things Furthermore horrifying.
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