Humans cannot travel to other planets. We don’t have the knowledge or intelligence to make the technology to do such a thing. If the aliens turn up on Earth then it seems it should be pretty obvious that *they do* have said smarts and technology, therefore at least in some aspects they are more intelligent or superior to humans. It doesn’t make much sense for aliens to travel hundreds of billions of miles through deep space only to be dazzled by our Earthly technology.
In settings where humans *can* travel to other planets (such as Star Trek) aliens are usually presented where there are some which are more advanced and some which are less advanced than humans.
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