|
Just a few wee additional comments :
1) I have no doubt there are other technological species out there, the universe and our galaxy is probably swarming with them.
2) I have never seen any convincing evidence that they are currently visiting us - much as I would like to have them do so providing they don't see us as potential slaves, or a good source of food, or as an inconvenient infestation that needs to exterminated to allow them to use the earth's resources.
3) have they visited earth in the past ? - well the past is very long time - earth has been a visitable destination for over 4,000.000,000 years , so I'll concede they might have dropped by some time , perhaps even frequently , in the geological past (millions , or billions of years ago , even if they are limited to travelling at subluminary velocities, plenty of time to do that since the earth formed) - no evidence of such visits exists that I have heard off.
|