How do we know the universe outside our solar system truly exists?

This is something that has been bothering me for a while as I’m diving through space articles, documentaries etc. All seem to take our observations for granted, which are based on the data of the entire observable universe (light, waves, radiation…) we receive at our, in comparison, tiny speck. How do we know we are interpreting all this correctly with just the research we’ve done in our own solar system and we’re not completely wrong about everything outside of it?

This never seems to be addressed so maybe I’m having a fundamental flaw in my thought process.

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10 months ago
Other than the fact we can see stuff and measure it? In which case: How do you know the solar system itself is real? That you exist? Everything could be a simulation or a dream.

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