The visible Universe extends 46.1 billion light-years from us, while we've probed scales down to as small as ~10^-19 meters.
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Nothing lives forever, at least, not in the physical Universe. But relativity allows us to get closer than ever, from one perspective.
Two of the answers add a dimension to physics that doesn’t belong there. Maybe we could call it "astrotheology."
Unless you confront your theory with what's actually out there in the Universe, you're playing in the sandbox, not engaging in science.
Is the physical universe independent from us, or is it created by our minds, as suggested by scientist Robert Lanza?
Though he renounced philosophy, Stephen Hawking's final theory of the universe redraws the basic foundations of cosmology.
The science fiction dream of a traversable wormhole is no closer to reality, despite a quantum computer's suggestive simulation.
Physicists just can't leave an incomplete theory alone; they try to repair it. When nature is kind, it can lead to a major breakthrough.
There could be variables beyond the ones we've identified and know how to measure. But they can't get rid of quantum weirdness.
In the infant Universe, particle physics reigned supreme.
Although many of Einstein's papers revolutionized physics, there's one Einsteinian advance, generally, that towers over all the rest.
Einstein's relativity overthrew the notion of absolute space and time, replacing them with a spacetime fabric. But is spacetime truly real?
All of the matter and radiation we measure today originated in a hot Big Bang long ago. The Universe was never empty, not even before that.
A cute mathematical trick can "rescale" the Universe so that it isn't actually expanding. But can that "trick" survive all our cosmic tests?
Spiritual experiences can be explained in terms of a highly evolved brain. But they also can be extremely meaningful.
Protons and neutrons are held together by the strong force: with 3 colors and 3 anticolors. So why are there only 8 gluons, and not 9?
Two very different ideas, wormholes and quantum entanglement, might be fundamentally related. What would "ER = EPR" mean for our Universe?
The matter that creates black holes won't be what comes out when they evaporate. Will the black hole information paradox ever be solved?
Just by observing the tiny amount of deuterium left over from the Big Bang, we can determine that dark matter and dark energy must exist.
The brilliant mind who discovered the spacetime solution for rotating black holes claims singularities don't physically exist. Is he right?
Holograms preserve all of an object's 3D information, but on a 2D surface. Could the holographic Universe idea lead us to higher dimensions?
The whole isn't greater than the sum of its parts; that's a flaw in our thinking. Non-reductionism requires magic, not merely science.
The perfectly accessible, perfectly knowable Universe of classical physics is gone forever, no matter what interpretation you choose.
In our Universe, matter is made of particles, while antimatter is made of antiparticles. But sometimes, the physical lines get real blurry.
One research group's AI-based drug discovery platform could be redesigned to discover VX nerve agent and 40,000 similar chemical weapons.
A proponent of panpsychism argues moral truth is inherent in consciousness.
There's a speed limit to the Universe: the speed of light in a vacuum. Want to beat the speed of light? Try going through a medium!
Everything you ever wanted to know about the Universe, explained by physicist Sean Carroll.
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The way to understand the earliest moments of creation is to recreate those conditions and study them. Why would we stop now?
Quantum uncertainty and wave-particle duality are big features of quantum physics. But without Pauli's rule, our Universe wouldn't exist.