Stephen Hawking warning about aliens from space

I think this will be on the Discovery channel. He states there are many types of life in the universe in the 100 billion galaxies. Any that could get here would be so far ahead of us that their motives could be resources or anything. He seems to be saying lay low & call no attention to this planet. Anyway, he has been a noted scientist the last 30 yrs and it is so hard that he has his severe physical disabilites while his brain(genius) is soooo intact. Now, last week Drudge had up a new Nebula that had a pillar that was 3 light years tall. It was taken by Hubble. I think that may be 365 days x 3 yrs x 187,000(rounded off) PER SECOND !!!!!!!!!! to travel to its top . Want to feel small ?