Hi! Okay so I was thinking about black holes and I was wondering if they're hot since they were suns? But I was also thinking that they might be cold because the whole nothing can escape thing (even heat I would imagine) but my thing is, if all that stuff is going in there.. then how is it's energy being converted because it can't just be destroyed right? (Sorry if this is all wrong I'm only in highschool)
Black holes are actually quite cold! Inside the event horizon the temperatures are (very probably) nearing absolute zero. (.000006 Kelvin to be more precise) Though black holes were stars at one point, that doesn’t really have anything to do with their “active” temperature.
This isn’t to say that there isn’t any heat around black holes; in fact directly outside the event horizon temperatures can reach hundreds of millions of degrees due to the particles being accelerated to speeds near the speed of light.
Also, don’t let anybody ever let you think that just because you’re in high school that you’re inherently wrong! (I’m only a senior myself)
I hope this answered your question, and please let me know if I need to clarify or correct anything! :)