A global space force...A global space force to fi...Follow
2 links have been added on this idea.
  1. Any invading species will likely have superior intelligence or weapons; thus, any defence would be futile!
    https://www.nbcnews.com/storyline/the-big-questions/why-these-scientists-fear-contact-space-aliens-n717271

  2. Sadly, earth is not ready to defend against an alien invasion, especially with the way governments across the world are divided.