if everything that is surrounding us and everything else (the sun, other stars, planets etc) is cold to the point of beeing at absolute zero, how can things be at such a higher temperature? how can, for example, a spaceship keep a confortable temperature in the inside if outside there is such a massive temperature drop?
sorry for the many questions, but they all are part of the same big one 😀
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Stars, like the sun, are definitely not cold or surrounded by cold.
Space in general is cold because most of it is empty, but things in space are only cold when they don’t have a source of heat.
You would actually have to deal with a lot of heat if you left earth and got direct sunlight without earth’s atmosphere to protect you like it does here and with no air for you to radiate your heat away.
Anyway, to answer your question; the sun and other stars get to be very hot because they are massive fusion reactors that release tons of energy. They are their own heat source.
Planets also have some heat of their own. From my understanding, planets like earth are rocky with a molten core; however, that isn’t what makes earth warm for us, that molten core’s heat sometimes heats up some areas in deep oceans, but it rarely makes it to the surface where we live.
Most of our warmth comes from proximity to the sun.
The reason earth has a nice temperature is our atmosphere. We have a greenhouse effect going on. Some gases in our atmosphere, like CO2, are good at limiting how much heat and UV lights from the sun comes in, but also how much can leave.
It means it doesn’t let all of the sun’s warmth in to cook us alive during the day, but that what gets inside stays inside for longer so we don’t freeze at night.
This is why climate change is such a scary thing to mess up like we did. We have too much of these greenhouse gases building up faster than ever before, and we are holding onto more heat, which increases the global temperature and causas all sorts of problems that stack up over time.
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