Watch the skies! Keep watching the skies!:
http://www.huffingtonpost.com/2010/0..._n_551035.html
Any alien species that can build starships to get to Earth can probably
figure out how to mine raw materials for their civilization from more
nearby stars and planets that are uninhabited rather than coming here to
obliterate humanity and take over Earth...unless, of course, their
intention is to EAT US...what do YOU know that the American public
doesn't know, Professor Hawking?
Are the aliens coming here to EAT US?
"Yes" or "No" Hawking?
Flash the Captain Pike light once or twice so we will know the answer.

Pat