Why havent aliens landed yet on earth?

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I am getting frustrated. The earth has been habitable for 250 million years now and provides all sorts of sustenance. Why haven't they landed on Earth yet? Does this mean that aliens are probably not as advanced as we thought, or does it mean that they are so far advanced that they don't want to "pollute" our ecosystem by entering it? Come on aliens, come visit us.
 
Maybe there aren't any? And why are you assuming that if there are aliens, they would be capable of traveling all the away to Earth?
 
Who's to say that they aren't already here?

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They're not allowed to interfere with insects who cannot wipe their ass yet space-travel wise. Space politics and treaties. Some of them don't obey the rules but they soon get caught.
 
I am getting frustrated. The earth has been habitable for 250 million years now and provides all sorts of sustenance. Why haven't they landed on Earth yet? Does this mean that aliens are probably not as advanced as we thought, or does it mean that they are so far advanced that they don't want to "pollute" our ecosystem by entering it? Come on aliens, come visit us.

do you think that's a long time in the scope of the universe?
 
I am getting frustrated. The earth has been habitable for 250 million years now and provides all sorts of sustenance. Why haven't they landed on Earth yet? Does this mean that aliens are probably not as advanced as we thought, or does it mean that they are so far advanced that they don't want to "pollute" our ecosystem by entering it? Come on aliens, come visit us.

Needle in a haystack
 
The universe is bigger than any of us can even fathom. I do believe that alien life exists but our reality is so immense that it's not surprising we haven't met any other races yet.
 
Aliens are humans from the future.If they landed they may change the future or create some paradox and destroy the universe.
 
Be thankful that they haven't.

If they do anytime soon, they will undoubtedly be much more intelligent than we are, and the chances are high that we'll quickly be subjugated if not outright annihilated.

Another option is that we are simply so unintelligent that aliens have observed us and don't find us worth bothering with.

I'm not sure which option makes you feel better.
 
do you think that's a long time in the scope of the universe?
Wikipedia says the big bang was about 13.8 BILLION years ago, so yeah that's about 55 times the habitable period of the earth. All of the Star Wars movies could have happened before earth was even an option!
 
Because no one can travel faster than the speed of light. (Well, some may not agree, but if it wasn't true then we'd have tons of alien visitors daily)

edit: this also applies to time traveling, no time travelers from the future, is an indication that its impossible, no matter how advance we become.
 
They probably have a very strong protocol on how to approach new civilizations, and i'm pretty sure that intervening in any species' natural technological progress is a very risky proposition.

It's likelier that they would observe and learn about earth without interfering or revealing themselves. Also space exploration is likely to be a very restricted enterprise, space mining is probably hella regulated and intelligent life probably isn't popular enough to justify anything more than a small number of dedicated patrols.
 
Be thankful that they haven't.

If they do anytime soon, they will undoubtedly be much more intelligent than we are, and the chances are high that we'll quickly be subjugated if not outright annihilated.

Another option is that we are simply so unintelligent that aliens have observed us and don't find us worth bothering with.

I'm not sure which option makes you feel better.

We might also be the only intelligent life forms.
 
All of the advanced alien species killed themselves. Some of them created Artificial Intelligence which did the killing instead. Robots can't be arsed to invade Earth, they're content to hibernate while drawing power from the stars.
 
Why haven't we?

Why do we assume that aliens are bound to be scientifically more advanced than us? Yes, they'd have to be if they were to come say hi to Earth. But maybe they are just not smart enough, or they don't have the resources.

There's bound to be life out there, don't get me wrong. But for the same reasons we haven't met them, they haven't met us.
 
There could very well be another planet similar to ours in another solar system. That however doesn't mean that they are more advanced then us.
 
Any ET might be still on our level. Suppose their evolution has taken similar time and they're advancing in technology in roughly same pace. If so, any first contact is going to be far in the future.

Or aliens might be underwater beings, which means they cannot advance technologically (no fire, no metal, no inventions that depend on metal, the end.)

Or they're simply so far, far away, perhaps even in another galaxy... there won't be visits then.
 
Why would aliens visit us? Any alien race advanced enough to travel light years to Earth is so far above us technologically that we likely can't offer them anything that would interest them.
 
Be thankful that they haven't.

If they do anytime soon, they will undoubtedly be much more intelligent than we are, and the chances are high that we'll quickly be subjugated if not outright annihilated.
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If a species is "much more intelligent" I don't see why we couldn't assume they'd actually be far more peaceful than us. A species that has developed enough to travel through space presumes cooperation in various ways. I don't know. I certainly hope that an advanced species would be like that. If they're really violent and happen to be super intelligent...that would be a fucking nightmare.
 
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