Are we alone out there? The mystery of life in the Universe

[Tanya Li]

Hi everyone,
I wanted to start a discussion about one of the most fascinating questions in science: are we alone out there?

Given that there are billions of Earth-like exoplanets in our galaxy alone, the odds seem high that life could exist elsewhere. However, we haven't found any definitive evidence yet (the Fermi Paradox).

As a student interested in astrobiology, I wanted to ask the community: do you think we will find evidence of microbial life (like on Mars or Europa) in our lifetimes, or are we more likely to detect intelligent signals from deep space first?

I would love to hear your thoughts and theories!

 

[javisot]

As a student interested in astrobiology, I wanted to ask the community: do you think we will find evidence of microbial life (like on Mars or Europa) in our lifetimes, or are we more likely to detect intelligent signals from deep space first?

Greetings. If those are the two options, I personally choose the scenario where we first discover microbial life (assuming it exists), based on a very simple argument: microbial life is simpler than intelligent extraterrestrials, and therefore more likely to exist and be found.

 

[Tanya Li]

Greetings. If those are the two options, I personally choose the scenario where we first discover microbial life (assuming it exists), based on a very simple argument: microbial life is simpler than intelligent extraterrestrials, and therefore more likely to exist and be found.

Thanks for your input. I think that's a really logical argument. Even though finding microbes isn't as dramatic as receiving an intelligent signal from space, discovering even a single alien bacteria would still completely change our understanding of biology forever.

 

[FactChecker]

Greetings. If those are the two options, I personally choose the scenario where we first discover microbial life (assuming it exists), based on a very simple argument: microbial life is simpler than intelligent extraterrestrials, and therefore more likely to exist and be found.

On Earth, we seem to find life in places we long thought were impossible, as long as there is some source of energy. And the definition of "life" is getting more diverse. I think we will find some form of life within our Solar System, long before we get real proof from other star systems.
This is just the opinion of a casual amateur, but I'm not sure that expertise gives you much in answering this question.

 

[WWGD]

On Earth, we seem to find life in places we long thought were impossible, as long as there is some source of energy. And the definition of "life" is getting more diverse. I think we will find some form of life within our Solar System, long before we get real proof from other star systems.
This is just the opinion of a casual amateur, but I'm not sure that expertise gives you much in answering this question.

I think there's a technical definition of life. @BillTre may know it.

 

[PeroK]

Hi everyone,
I wanted to start a discussion about one of the most fascinating questions in science: are we alone out there?

Given that there are billions of Earth-like exoplanets in our galaxy alone, the odds seem high that life could exist elsewhere. However, we haven't found any definitive evidence yet (the Fermi Paradox).

As a student interested in astrobiology, I wanted to ask the community: do you think we will find evidence of microbial life (like on Mars or Europa) in our lifetimes, or are we more likely to detect intelligent signals from deep space first?

I would love to hear your thoughts and theories!

The only valid answer at this stage is that we don't know. There are already some threads on here about this.

 

[loop quantum gravity]

Hi everyone,
I wanted to start a discussion about one of the most fascinating questions in science: are we alone out there?

Given that there are billions of Earth-like exoplanets in our galaxy alone, the odds seem high that life could exist elsewhere. However, we haven't found any definitive evidence yet (the Fermi Paradox).

As a student interested in astrobiology, I wanted to ask the community: do you think we will find evidence of microbial life (like on Mars or Europa) in our lifetimes, or are we more likely to detect intelligent signals from deep space first?

I would love to hear your thoughts and theories!

Probably if there are aliens they don't want to be detected.. (espiecally with a violent animal like us...
). Have you seen Men In Black, good movie! (some say it's a documentary... kiddin').

 

[pinball1970]

are we alone out there?

If we are alone, it seems like an awful waste of space.....

If it turns out there is a lot of life, say per galaxy I would not be surprised. The universe is good at making complex molecules and there may be more than one way of getting to "life."

A recent publication.

https://arxiv.org/abs/2608.14381

 

[FactChecker]

I think there's a technical definition of life. @BillTre may know it.

There seems to be a variety of definitions, some of which (IMO) would include things as basic as prion diseases, and others would require more complicated functions.

 

[BillTre]

I think there's a technical definition of life. @BillTre may know it.

There are many definitions of life. Non-reign supreme, but some are probably considered more useful, like the NASA definition (which has its problems) and Cronin's assembly theory (which doesn't say how life works).