If exoplanets discovered by scientists are what they were thousands of (light) years ago what if life developed on them thousands of years later in our present time? Theres no way to confirm the existence of alien life because you're always looking back thousands of years into the past with the telescopes!
Well, actually observing the ariens isn't the only way of confirming their existence, we could also pick up on waves, if any ever come our way, which is super unlikely.
What makes you think that there could happen any significant change in evolution in that time?
I think that even if we cant send humans on those planets, we should send life. Just shoot some microbiological cocktail on few of those exoplanets. It doesn't matter that it wont evolve to be humans, life is life.
>millions of visible stars in night sky
>most are millions and billions of light away from each other and us
>all look exactly the same size
has someone come up with an explanation for this yet?
We will soon have the instruments to analyse the atmosphere of exoplanets. One of the first things to look for is free oxygen since that does not occur abiotically. From what we know you need plant life or similar to photosynthesize oxides into free oxygen and other chemicals.
You asked about life but perhaps you had intelligent life in mind?