- #1
Gondur
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We can indirectly measure the atmospheric composition of worlds outside our solar system.
Suppose there are aliens out there.
On their world, they use the same technique we use to measure the atmospheric composition of worlds.
Suppose they turn their telescope on Earth.
Is it possible they conclude Earth is an 'Earth-like' planet much like their own that may support life? In the same way we have concluded there are many Earth like planets out there that may support life?
So, at this point in time, could there actually be distant civilisations in the milky way who know that Earth is one of many planets they have observed that may sustain life by measuring Earth's atmospheric composition, but don't actually know about 'us'?
Suppose there are aliens out there.
On their world, they use the same technique we use to measure the atmospheric composition of worlds.
Suppose they turn their telescope on Earth.
Is it possible they conclude Earth is an 'Earth-like' planet much like their own that may support life? In the same way we have concluded there are many Earth like planets out there that may support life?
So, at this point in time, could there actually be distant civilisations in the milky way who know that Earth is one of many planets they have observed that may sustain life by measuring Earth's atmospheric composition, but don't actually know about 'us'?
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