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" ... If there’s one rule that people know about how fast things can move, it’s that there’s a cosmic speed limit: the speed of light in a vacuum. If you have any amount of mass at all — like anything made of atoms — you can’t even reach that limit; you can only approach it. Meanwhile, if you have no mass and you’re traveling through completely empty space, there’s no other speed you’re allowed to move at; you must move at the speed of light. And yet, if you think about how big the observable Universe is, we know it’s grown to 92 billion light-years in diameter in just 13.8 billion years. Moreover, by the time just one second elapsed since the Big Bang, the Universe was already multiple light-years across! How is this possible without breaking the laws of physics? That’s what Roberto Cánovas's son Lucas wants to know, inquiring: ... "
" ... It’s a cosmic occasion called perihelion—the point of the Earth’s orbit that is nearest to the Sun. The word comes from the Greek words peri (near) and helios (Sun). ... "
" ... The cosmic web of dark matter and the large-scale structure it forms. Normal matter is present, but ... [+] is only 1/6th of the total matter. Meanwhile, matter itself only composes about 2/3rds of the entire Universe, with dark energy making up the rest. The accelerated expansion suppresses extremely large-scale structure, as dark energy prevents gravitational collapse from occurring on extremely large cosmic scales. ... "
" ... We don’t know how this cosmic discrepancy will be resolved, but it appears to be a real cause for concern. On the mundane side, it could be that there is a conceptual error in one or more of the current analyses. On the exciting side, it could be that there is more to learn about the evolution history of the cosmos. We’ll just have to wait for the answer. ... "