Alien nomads could destroy earth

[mapuc]

If the title was my thoughts most of you would laugh, but it ain't and isn't that funny if I or some one else not known said these things

Here are the link to the article where a famous person has said these things

http://www.dailymail.co.uk/sciencete...roy-world.html

Such advanced aliens would perhaps become nomads, looking to conquer and colonise whatever planets they can reach