Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.
The Universe is big, as Douglas Adams would say. The most distant light we can see is the cosmic microwave background (CMB), which has taken more than 13 billion years to reach us. This marks the edge ...
Scientists can only see so far before they run into the edge of the universe. Will we ever know if anything lies beyond? This image shows the cosmic microwave background—the oldest light in the ...
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