I'm kind of vague on this so please don't hold me to detail but you'll get the basic gist..
We've been sending probes out for a very long time now..
They all have some sort of message on board in case they're ever found by a more advanced civilization..
Where we are in the milky way,, a road map to get here,, who we are,, what we are ect..
We've also been sending out radio waves for more then a half century..
Dr Hawking was asked his opinion on the subject of us basically screaming out into the universe "here we are" "come say hello"...
His response was to point bout each and every time in human history a more advanced group came across a less advanced group..
From the Spaniards in south America with the Incas to the Indians in North America...
It just never seems to go very well for the less advanced race.........
He basically recommended that we shut the heck up,, lol..
R.I.P. Dr Hawking...
Teddy