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one question about objective reality you'd want answered

My question will be "How will Humanity end"?

In 5 billion years when the Sun dies, will Humankind still be around in whatever form - spread out across the stars - or will we be forever confined to the Sol system and when it goes, our descendants will go with it?
 
One question I've had is why is the sky blue. I can understand clouds being dark and gray, but why blue for the Sky?
 
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