THE ARCHIVE
Every question we have explored so far.
Einstein CentennialExplainer
Einstein and Bohr agreed that quantum mechanics works, but they spent decades arguing about what it tells us is real, and the argument still echoes today.
Einstein CentennialFeature
A century ago, Einstein told Max Born that "the Old One" does not throw dice, starting an argument that reshaped physics and is still not finished.
The UniverseExplainer
Not really holes and not cosmic vacuum cleaners, black holes are places where matter is packed so tightly that not even light can climb back out.
The UniverseExplainer
Galaxies spin too fast and light bends too much, so something unseen seems to be out there, but nobody yet knows what it is.
The UniverseExplainer
In 1998 astronomers found that the universe's expansion is speeding up, and "dark energy" is the name for a cause nobody yet understands.
The UniverseExplainer
Shadows, stretching space and a famous neutrino scare all seem to break the cosmic speed limit. Here is why the limit still stands.
The UniverseExplainer
The Big Bang should have left an almost empty universe. A tiny surplus of matter built everything we know, and nobody yet knows why.
The UniverseExplainer
Physicists have merged forces of nature before. Gravity is the holdout, and no candidate theory of everything has yet passed a decisive test.
OriginsExplainer
From the first atomic nuclei back to a possible burst of inflation, here is what scientists have tested about the first second, and where knowledge runs out.
OriginsExplainer
The part we can see is about 93 billion light-years wide, but whether the whole universe ends, loops back or goes on forever is still unknown.
The Architect AI companion · All Access
