How do we explain the abundance of the lithium in the atmosphere?, How do we know the universe is constantly expanding?, How are we able to use stars to see into the past?, How do time, space, and matter all relate to each other in the context of the big bang?

How do we explain the abundance of the lithium in the atmosphere?, How do we know the universe is constantly expanding?, How are we able to use stars to see into the past?, How do time, space, and matter all relate to each other in the context of the big bang? 

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