Though I find it ludicrous to assert that earth is the only place in the universe harbouring intelligent life, I don’t think intelligent aliens have yet visited earth. Why?
~ Roedy (1948-02-04 age:69)
- Somebody like Wikileaks would have released secret government documents by now. These are too juicy to hold on to.
- Aliens would know we are here by atmospheric changes from the industrial revolution and from radio and TV broadcasts. These would have reached a sphere only about 100 light years radius surrounding earth. Even if aliens noticed and immediately set off for earth at the speed of light (or sent a laser beam back) they would not get here for yet another 100 years. Our local Milky Way galaxy is 100,000 light-years across. Just to check for intelligent life anywhere in our galaxy we would have to wait at least 200,000 years.