I make www resolve but just forward to the URL without it. I don't like the way www looks and having to say it is annoying. Whichever you pick, you should use

I make www resolve but just forward to the URL without it. I don't like the way www looks and having to say it is annoying. Whichever you pick, you should use that one and redirect the other to it, just so there is one consistent set of URLs. nasa.gov doesn't resolve because www.nasa.gov is a CNAME to Akamai hosts for load balancing purposes, so they can't use the same thing for just nasa.gov (and manually inserting A records would get out of date and not distribute load properly). Google has the same setup (www is a CNAME), but because they control all of the hosts that the CNAME resolves to, they can put those same host records as google.com.