no no no.
all those lights were, were top secret military aircraft.
if aliens do exist, or rather did visit earth in the past 1000 years dont you think we woulda known about it?
think about it.
if you had enough smarts to fly through space from you planet to earth, dont you think you would make your presence known on earth?
for instance, when American first visited the moon, and then mars 30 some odd years later, did we leave any signs of our visit?
as far as i can recall, an American flag was left on the moon, and a whole bunch of technical robotic shit was left on mars.
Therefore, we can half-assed conclude that if intelligent life DID indeed visit earth....
they woulda made their presence known to the entire population somehow.
do you really think that some alien is going to travel 99 billion light years just to fucking knock on the white house door and drink tea with Bush?
no, the would most likely land in a populated area, and send out a search party.