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15

They'd be spotted If the aliens were orbiting at the altitude of the ISS, and if the eyes of the aliens are similar to ours, and they were looking at the earth without telescopes, they would be able to see fires burning at night. In the 1940's Selig Hecht and his associates measured that the light from a flickering candle could be seen at a distance of up ...


15

It's irrelevant, unless you're proposing a technology dichotomy Aliens have traveled all the way to Earth, but the only way they have to examine the planet from a distance is optics? Ignoring the fact that they'd at least have the technology for thermal imagery (detecting fires, lanterns, even people and animals, by their heat emissions), they could easily ...


8

The only "ethical" solution is if the aliens are actually trying to help us to begin with. Let's assume the Earth is experiencing a runaway greenhouse effect that was already killing us, but the aliens thrive on worlds that are hotter than modern Earth. They have the technology to warm a planet up and build up it's atmosphere, but not to go in the other ...


6

How quickly do the aliens need to get rid of humans? The simplest solution, which has been exercised in works of fiction like Half Life 2, is to inhibit human reproduction, either through sterilization or the potentially more peaceful route of simply chemically inhibiting the urge to reproduce. This gives you a pretty good guarantee that all humans, or the ...


5

At best, it would look kind of like North Korea in modern times: Kind of nice, in a way...


5

TL;DR: with the best will in the world and a totally willing populace, its probably gonna take you decades to move everyone from earth. You can't just build new sustainable environments on barren lifeless radiation swept balls of rock for 8 billion people overnight, and you won't be picking all those people up and moving them to their new homes at once. ...


4

Like botava above said, make them want to leave. I just want to add that the "carrot" he describes should be supplemented by a "stick". Aliens could make Earth less pleasant to live on. Military approach is very crude (look up Holocaust). Spreading a disease is more subtle, but can backfire if discovered (and it will be discovered with so many curious and ...


4

Let them choose to leave. A simple way of convincing yourself of being ethical in depopulating the Earth is letting people choose whether they want to leave or not. Create a somewhat better place for them on Mars and then launch a large marketing campaign asking people to sign up to move to Mars. If your campaign is good enough many people will leave. That ...


3

First, one have to wonder just how ethical any sentient species is if they still engage in warfare. After all, war does involve killing lots of people, & the destruction of property & wealth, both of which leads to chaos & misery. Second, one would have to think in terms of this non-human species. For example, their civilization might be highly ...


3

Yes, this should be possible. Nature is capable of creating and withstanding acid fluids (most obvious example: the stomach), so having acid blood developed as a defense mechanism sounds not that strange. The blood would most likely still be red if not alternative molecules for the transport of oxygen are used. Only problem I see here is that the whole body ...


2

Communication is a key aspect of any advance Race. It doesn't matter how they communicate, because there will always be a transmission of some form of wave, action or imagery that we will be able to detect and decode. Its just a matter of time until a translation is created between the two, given they are not immediately hostile. The issue is how an Alien ...


2

To amplify StarfishPrime's comment, a natural defense biomechanism which releases (and possibly generates at the time of injury) acid or alkali fluid is a lot easier to justify than the blood itself. Related capabilities in Terran animals: snakes which spit venom, frogs whose epidermis contains toxins.


1

1) Acid erosion - No. Alien would need to wear a hazmat suit if our environment is reactive for their race. Or, if they can walk "naked" on Earth - they will not be that reactive. 2) Fluctuations in electricity - to aliens as an organism no, for their tech - yes. Fluctuations mean that something emmits a lot of energy. Biological systems which emmit so ...


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