The combination of charge conjugation, parity, and time-reversal symmetry is known as CPT. And it must never be broken. Ever.
Search Results
You searched for: Universe
With a massive, charged nucleus orbited by tiny electrons, atoms are such simple objects. Miraculously, they make up everything we know.
Yes, dark energy is real. Yes, distant galaxies recede faster and faster as time goes on. But the expansion rate isn't accelerating at all.
What do ghosts and anomalous galaxy rotation rates have in common? Some sci-fi enthusiasts believe the answer involves "parallel universes."
If the Universe is expanding, and the expansion is accelerating, what does that tell us about the cause of the expanding Universe?
The Universe certainly formed stars, at one point, for the very first time. But we haven't found them yet. Here's what everyone should know.
Perhaps the whole Universe is the result of a vacuum fluctuation, originating from what we could call quantum nothingness.
There is no such thing as a void in the Universe.
By probing the Universe on atomic scales and smaller, we can reveal the entirety of the Standard Model, and with it, the quantum Universe.
Everything we observe beyond our Local Group is speeding away from us, omnidirectionally. If the Universe is expanding, where is the center?
Bang bang all over the Universe.
In many ways, we are still novices playing with toy models seeking to understand the stars.
With no other galaxies in its vicinity for ~100 million light-years in all directions, it's as isolated and lonely as a galaxy can be.
From ancient Greek cosmology to today's mysteries of dark matter and dark energy, explore the relentless quest to understand the Universe's invisible forces.
What would become the Big Bang model started from a crucial idea: that the young Universe was denser and hotter.
After 15 years of monitoring 68 objects known as millisecond pulsars, we've found the Universe's background gravitational wave signal!
Empty space itself, the quantum vacuum, could be in either a true, stable state or a false, unstable state. Our fate depends on the answer.
From a photon's viewpoint, the Universe is timeless and dimensionless.
The Big Bang is commonly misunderstood, warping our understanding about the Universe's size and shape.
The first observational evidence showing the Universe is expanding is 100 years old now: in 2023. Here's the story of its 100th anniversary.
A proponent of panpsychism argues moral truth is inherent in consciousness.
A cute mathematical trick can "rescale" the Universe so that it isn't actually expanding. But can that "trick" survive all our cosmic tests?
Ever since the Big Bang, cataclysmic events have released enormous amounts of energy. Here's the greatest one ever witnessed.
It's been 100 years since we discovered that the Universe was expanding. But if it's expanding, then what is it expanding into?
The answer to this question is key to understanding why anything exists.
Every time our Universe cools below a critical threshold, we fall out of equilibrium. That's the best thing that ever happened to us.
From quarks and gluons to giant galaxy clusters, everything that exists in our Universe is determined by what is (and isn't) bound together.
The image you're seeing isn't a hole in the Universe, and the cosmic voids that do exist aren't hole-like at all.