Place: Everywhere
How: They come out of the sky
When: Anytime... maybe in the next couple of minutes O.o
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Place: Everywhere
How: They come out of the sky
When: Anytime... maybe in the next couple of minutes O.o
To continue with Kevin's answer:
3) We invade them
It is my feeling that any life form that can travel amongst the star would not have hostile intents against anything. For humanity, it hasn't matured to that point; the people of Earth have a long ways to go.
No one can know the answer to that question.
We don't yet know if interstellar travel is possible in practice.
Assuming, from the question, that an alien invasion were to occur...
(Also, heavily relying on the use of the word "invasion" assuming that it occurs "in force" and not at our invitation)
I have two ideas. (And one subset)
1 - The alien race grew in a manner similar to life on earth, and ultimately the most aggressive and capable race became the dominant species on their planet. Assuming space is "mostly" empty and this race has the option to choose where they're going, since there is very little reason for them to come to earth (given the choice of going /anywhere/ in space)*, they're probably xenophobic and just think that they're better off without us around.
1b - The alien race believes that the major holy person of their religion has something to do with Jerusalem, and so has come to fight over it too.
2 - The alien race exists in a way that we don't readily perceive. Perhaps some kind of interdimensional intelligent fungus. It "invades" earth (and may actually jointly exist within our bodies) without us ever even knowing it.
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