This is a nice little script.

    function wayback_link(url) {
      return `https://web.archive.org/web/${url}`;
    }

    console.log(wayback_link("https://github.com"))

If you use DuckDuckGo as your default search engine, it's also enough to (in Firefox or Chrome or any other browser where the URL bar functions as a search bar) prepend the URL with "!wayback " (without the quotes, but with the trailing space).

You could also do the same with "https://web.archive.org/web/", but "!wayback " is easier for me to remember.

I just went to https://web.archive.org/web/news.ycombinator.com (no date in the url) and it sent me to the most recent snapshot.

Perfect, of course that's how this should work. Updated :P

Until somebody decides to mess with the robots.txt on that domain and archive.org removes the copy... <sigh>

All this is irrelevant to the issue of warning aliens about radioactive waste however, since if we could preserve archive.org, I'd assume we could also preserve a database of radioactive waste locations.