Will you detect a cell phone signal 100 light years away?   

Maybe it's a Stellaris situation, where everyone invariably wipes themselves out in a nuclear war.

There could be a couple of reasons why we haven't detected ET yet. If ET can travel between systems it won't be by using what we consider conventional technologies. It wouldn't make any sense considering the distances involved. Our closest neighbor, the Centauri system, at 3.25 light years distant couldn't be done in less than 100,000 years so a decent propulsion system is kinda mandatory. The best we can do is drive a single particle to 99.7 +/- 0.3 % light speed using the LHC. Even if we could match it it would take a little more than three years to reach the Centauri system. So...

If ET is further out its gonna take years to go anywhere. An FTL drive is essential if you want to cut travel time. Why we haven't heard from anyone yet could be because they're still on their, they're at the same level we are or ET doesn't want us out there before we're ready. The latter would be IMO the best bet when you think of the state of our world today.

Within our solar system most likely it will be primitive life forms, microbes should be quite plentiful. Organic building blocks have already been found but nothing conclusive to date. Between Mars, Europa, Enceladus, (not including Titan. Who wants to live in a gas tank). Eventually they're gonna find something to prove life isn't exclusive to Earth.  

Not to worry though. Andromeda is quickly headed our way. In about 2 million years or so Andromeda and the Milky Way will be more than just kissing cousins.

I am sure that we live in a multi verse and each one of us probably

exist in more than one universe at the same time.

There is life out there.

Take the worm hole in space to another universe and see the evidence.   

Click here.

I've heard-tell there's intelligent life on THIS planet....then I go to reddit and I'm not so sure....

The most advanced life I have seen on earth is the lizard.

They have armor plating so bugs can't bite. They sun bathe 

and are their own bait for the bugs that fly by that they eat.

They do some push ups to stay in shape and don't work them selves to death.

If it gets cold they sleep until it is time to sun bathe again.

Here is another universe for the people on demigod.

The Australian Aborigine has been around longer than that...

"The first Aboriginal genome sequence confirms Australia's native people left Africa 75,000 years ago."

http://www.australiangeographic.com.au/news/2011/09/dna-confirms-aboriginal-culture-one-of-earths-oldest 

Not necessarily. Aside from carbon the next closest analogy for life is silica. A silicon based life form for example could thrive on a planet whose surface temperature would be hostile to carbon based life forms.

Yes as Carbon 14 has a known rate of decay which allows organic objects to be dated. Inorganic objects are more difficult to date. Stable isotopes such as carbon 12 do not decay, they age, because if it did we wouldn't be here. Carbon, being among the most plentiful molecules, may allow for other forms of intelligent life out there. If you look at all the diverse life forms on Earth, all carbon based, I believe there's no real limit to how many others there could possibly be. 

About 99% of the carbon in your body is the non-radioactive carbon 12.  About 1% is the non-radioactive carbon 13.  You have some very small amount of the radioactive carbon 14, which has a half life of 5700 years.  Carbon 14 is produced naturally in the upper atmosphere when cosmic rays react with nitrogen 14 atoms.

Or maybe these other cultures are exactly like us  

Have any of you read the chinese scifi series Remembrance of Earth´s Past? It does concern the contact with alien civilization and it is really, really good, perhaps even better than Expanse.  Apparently Amazon intends to make the TV show from it for some heavy money - that would be beyond awesome.