Awesome shot.
To put things in perspective, the number of Bitcoin private keys that can ever exist is approximately 10
53 times the number of stars in the known universe. In other words, if each star in the universe corresponded to one Bitcoin private key, then the entire universe would only be able to contain...
0.000000000000000000000000000000000000000000000000001%
of all possible Bitcoin private keys.
Put in another way, it would take...
100000000000000000000000000000000000000000000000000000
universes to fit all possible Bitcoin private keys.
As you can see, OOM, your post is totally on-topic!

Nit: Although this is technically correct, and awe-inspiring in itself, I suggest always making sure to base such discussions on Bitcoin’s notional 128-bit security level.
This seems ridiculously pedantic to note in this context—until one experiences too many technical threads based on people thinking in terms of bruteforce. Educating people in these terms tends to form that mindset. The number of all possible Bitcoin private keys has no
direct relevance to Bitcoin’s security: Any real-world attacker will attack the public key with
an ECDLP solver, which will crack the key on the order of 10
38 times faster than bruteforce.
What people need to understand is that Bitcoin has
astronomically-huge security. You are
literally talking about
astronomically-huge-squared.
