Linked Questions

0
votes
1answer
86 views

How far can a planet with living beings get before we cannot see the living beings? [duplicate]

Let there be a planet with Earth-like life. However, no trash or monuments or other visible structures, just organisms. How far can that planet be from Earth before our equipment just cannot observe ...
0
votes
0answers
96 views

What activities of human beings can be detected by aliens 1000 pc away? [duplicate]

Let's suppose they have similar technical level like us now. In radio band, what is our earth like? What signals can be linked to non-natural behaviour? How about optical band and other methods? ...
2
votes
0answers
63 views

Would radio telescope located anywhere within a 100 light year radius detect our radio emissions? [duplicate]

If there was a radio telescope, as sophisticated as our best radio telescopes within a 100 light year radius from earth. AND if its sole purpose was search for signs of artificial/intelligent radio ...
1
vote
0answers
46 views

Detecting people on Proxima Cen b [duplicate]

Recently the news announced the discovery of a planet with characteristics similar in size to earth with the possibility for liquid water, 4.2 light years away. Now, if there was a civilisation of ...
30
votes
3answers
2k views

If Alpha Centauri A's solar system exactly mirrored our own, what would we be able to detect?

Suppose there was an exact replica of our solar system 4.4 ly away (people included). What would we be able to detect and with what telescope(s)? Which planets? Could we detect radio transmissions and/...
5
votes
3answers
384 views

What types of signals is SETI (and other such efforts) looking for?

This seemed to be the closest group for this question. Every few months there are a few articles asking "Are we alone in the universe" which focus on the Fermi Paradox, the Drake Equation, and end by ...
4
votes
1answer
328 views

Can SETI certify whether or not Proxima b is inhabited by beings using electromagnetic communication?

Can SETI certify whether or not Proxima b is inhabited by beings using electromagnetic communication? By certify I mean by past, present or future observations using technologies available.
2
votes
4answers
237 views

Why haven't detected life in the universe?

It would seem that if life were relatively common in the universe that there would be a cacophony of noise somewhere in the electromagnetic spectrum. Is life so rare and distant that the waves haven't ...
0
votes
3answers
96 views

What is the next planned mission that can discover life on another planet? [closed]

I've heard that we have a great shot at finding life on Mars if we just drill deep enough down to the surface to the water and detect if its sterile or not. Are there planned missions to do this? If ...
1
vote
1answer
98 views

What are the prime challenges in search for extraterrestrial intelligence? [closed]

What have we been able to accomplish so far and what are the prime obstacles that block our sight? My understanding is that Radio Telescopes are the prime tool for the search. I wonder what kind of ...
0
votes
1answer
92 views

SETI search for extraterrestrial life [closed]

In all these years of listening, why hasn't SETI detected anything ? Is there no intelligent life out there or is it too far away to detect ?