So my understanding is that stars are born and die all the time with supernovae, black holes, etc. And we can see this in deep space all the time but why can’t we see that with the naked eye? Why are our constilations the same as when I was a child? If stars are born and die all the time in our universe Why don’t we have a new night sky every few decades? I know a stars life is long so not all stars will change in my life time but there’s no new ones born or no old ones that die close enough for us to see when we look up
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Our Universe is expanding and with it the things inside. Stars radiate light. Since light travels in waves we can only see things within the visible spectrum. Through the expansion, these lightwaves are getting stretched thus „moving out“ of the visible spectrum of light. They are getting more red the further they are away from us as red light has a longer wavelength. This is called redshifting. This can Go even further when its stretched out even more into the infrared spectrum – which we cant See with our naked eye. This is also the reason why the James webb telescope takes pictures with an infrared camera. In one of those deep space Images you can Tell by the amount of red how far away galaxys are.
Another big factor is the time it takes the light to reach us. There are maybe millions of new Stars out there but we cant See them as the light is still traveling to earth. So when you look up in the Night sky you See the stars as they were millions of years ago, some of them maybe dont even exist anymore. And the Life of a Human is so short compared to a stars life. I mean the sun is like 5 billion years old and will be there for another 5 billion. So very unlikely that you will witness a new star appearing at the sky.
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