No it isn't. There's nothing about the content of the comments on anything on the internet that automatically means one comment warrants more attention than any other. The reason why we have voting systems is so the community can push things to the top. That's tempered by the fact Reddit moves fast so people who comment later are much less likely to get to the top of a thread, but really it just shows that people who vote in r/space value puns a lot. That's the community you're a part of.

It's like the opposite of HN. Every time I post a joke here it's like setting fire to some karma.