> I grew up very religious and when I lost my faith in my 20s, I tried to replace it w/ absurdism and existentialism, but couldn't shake the notion that lives deep in me that ultimately, even if humanity spreads across the cosmos and we're able to find meaning in our own individual existences, the universe will inevitably suffer heat death, from which there is no eternalistic escape.
Seems that this view of human existence as something inherently temporary underpins a lot of nihilist thinking. However, there is a lot of scientific evidence in favor of eternalism (i.e. the philosophy of time, as opposed to presentism) if you only care to look.
For one, it seems to me you have to basically reject all of relativistic physics if you want to maintain a perspective on the universe where only the present moment exists. This is because the relativity of simultaneity tells us that there is no such thing as a universal present moment. How can only a single moment exist when there is no such thing as a single moment?
I think a lot of people who despair in nihilist thought would do a lot better if they simply updated their understanding of universe from being stuck in the 19th century.