Questions tagged [extra-terrestrial]
For questions about objects or phenomena outside Earth, generally on other planets.
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What part of a star's habitable zone has the best chance of developing life?
I was thinking about superhabitable worlds a while ago, and I figured the best position regarding probability of life would be nearer the outer habitable zone, since it's easier to develop a ...
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How to know if an exoplanet is terrestrial?
NASA exoplanet archive, open exoplanet catalog and exoplanet.eu are some of the most famous catalog of exoplanet discovered by all techniques. However, all of these catalogs are missing the ...
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Calculating "maximum" distance to an alien civilization
I'm planning on making a video related to Fermi Paradox, and I've used Omni Calculator's Alien Civilization calculator as a reference. I noticed they have a field that calculates the "maximum&...
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I believe I saw a UFO, what else could it be? [closed]
When looking at the night sky some time ago I noticed a white dot. The amount of light coming from or being bounced on that object made it the same size of a average star. But differently from a star, ...
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Would we be able to discover a Voyager-style probe from a stellar civilization?
If some stellar civilization sent a space probe (say something similar to our Voyager probes in shape/size/materials and communication capability) and it ended up in a regular orbit around the Earth ...
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Detection of the existence of any extraterrestrial life
We can't see things in "real-time" but we see the "past versions" of the things because it takes time for the light from that object to travel to us. So looking far away means ...
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Could the timing of the oxygen spike on Mars be used to determine if photosynthesis is responsible?
I am wondering if the timing of the oxygen spike on Mars could be used to determine if photosynthesis is the source (which would be another indication of life on Mars), or if it is purely heat related?...
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Has SETI searched the solar system for life?
I know SETI is searching the stars for radio signals emitted by advanced alien civilizations, but has SETI searched inside our solar system - particularly moons, planets, and Lagrange points? I would ...
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Are there other life giving sources of energy in space apart from stars (like nebulae, radiation, etc.)?
Are there other life giving sources of energy in space apart from stars? (like nebulae, radiation, etc.)? Or are all possible life giving potential sources some variation of a star?
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Did Aliens make Oumuamua?
Dr. Avi Loeb, the distinguished astrophysicist and chair of Harvard's Astronomy Program, just published a book called Extraterrestrial: The First Sign of Intelligent Life Beyond Earth.
In the book, Dr....
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What does the amino acid found in the atmosphere of Venus mean?
An amino acid is a part of DNA, but it has only been found on Earth. Is the amino acid maybe from one of the space vehicles that has orbited, scanned, or surveyed Venus? How can a part of DNA survive ...
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How to communicate Fine Structure Constant to aliens? [closed]
Sorry if this is not the right question for this channel, I just need to know and there is no good place to ask.
It is said the Fine Structure Constant α is one of the most fundamental constants in ...
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Would we detect a spacecraft before it landed on Earth?
We have satellites and telescopes looking outward and inward to the earth. Would any of these detect an extraterrestrial spacecraft before it landed, or in other words, would we know a spacecraft was ...
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Would it have been possible to send a radio signal towards ʻOumuamua?
As we could not get any radio signals from asteroid ʻOumuamua, couldn't we have sent a powerful radio signal to it and then check if we can get any radio signal in response?
This way we can at least ...
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Kardashev scale [closed]
Why is becoming a type 3 from a type 2 civilization the hardest?
I have watched many videos on the topic and still can't figure out why?
Also is there a difference in technology between a type 4 and a ...
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