Search For Earth-Like Worlds Focuses On Sun's Siblings

Your analogy still fails.

It's certainly easier to see under streetlights. But you're not looking for your set of keys that you lost under these streetlights. To look for keys you lost is making the presumption that the keys exist, and that you lost them under the streetlight. In your analogy, you're looking for something specific, a thing you can attach a proper noun to.

What they're doing is more like looking for dicarded chewing gum. You think it exists. You're not looking for any specific piece of chewing

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