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The Drake Equation estimates the number of communicating civilizations in the galaxy — but several terms remain unknown.
Quantum field theory describes particles as excitations of underlying quantum fields that permeate all of space.
The information paradox — whether information is lost in a black hole — remains one of physics' deepest unsolved problems.
Superstring theory predicts 10 dimensions — our failure to detect the extra dimensions may mean they are too small.
The speed of gravity is equal to the speed of light — confirmed by the simultaneous detection of gravitational waves and light from neutron star merger.
The Chandrasekhar limit (1.4 solar masses) is the maximum mass for a stable white dwarf.
Neutrinos come in three 'flavors' — electron, muon, and tau — and can change between them (neutrino oscillation).
The zero-point energy of the vacuum is real and measurable — the Casimir force between metal plates proves it.
Wave function collapse describes how quantum superposition resolves into a definite state upon measurement.
Quark-gluon plasma — the state of matter a microsecond after the Big Bang — has been recreated at CERN.
The theoretical maximum temperature is the Planck temperature (1.4 × 10³² K) — above it, physics breaks down.
Baryonic matter (atoms) makes up only 5% of the universe — the rest is dark matter and dark energy.
The proton has been the subject of the 'proton radius puzzle' — measurements disagreed for years before resolution.
Cosmic rays — high-energy particles from space — were the first source of positrons (antielectrons) ever detected.
The half-life of the free neutron (outside an atom) is about 10 minutes — then it decays into a proton, electron, and antineutrino.
The collapse of a supermassive star produces more elements in seconds than all the stars in a galaxy do in their lifetimes.
Quantum tunneling allows particles to pass through energy barriers — it powers nuclear fusion in stars and scanning tunneling microscopes.
The electron has no known size — experiments constrain its radius to less than 10⁻¹⁸ meters.
Gravity is by far the weakest of the four forces — it's 10³⁶ times weaker than electromagnetism.
The holographic principle proposes that all information in a 3D space is encoded on its 2D surface.
The Boltzmann equation for entropy underlies thermodynamics and explains why time has a direction.
Quantum chromodynamics (QCD) describes the strong nuclear force — quarks are bound by gluons.
The Pauli exclusion principle prevents two fermions from occupying the same quantum state — it's why matter is solid.
E=mc² means energy and mass are interchangeable — the 'c²' factor explains why tiny amounts of mass release enormous energy.
The Copenhagen interpretation of quantum mechanics says particles don't have definite states until observed.
The many-worlds interpretation of quantum mechanics proposes that every quantum event splits reality into parallel universes.
The Planck length (1.6 × 10⁻³⁵ meters) may be the smallest meaningful unit of space.
General relativity predicts the existence of gravitational waves — confirmed in 2015.
Supersymmetry predicts a 'superpartner' particle for every known particle — none have been found at the LHC.
Dark matter doesn't interact with light — it's detected only through its gravitational effects on visible matter.
Neutrinos have almost no mass and interact so weakly that billions pass through your body every second.
The mass of a proton is 1,836 times the mass of an electron.
Virtual particles spontaneously pop in and out of existence in the vacuum — the Casimir effect proves this.
The Standard Model of particle physics describes 17 fundamental particles — but doesn't include gravity.
Quantum entanglement allows instant correlations between particles regardless of distance — but cannot transmit information.
The electron was the first subatomic particle discovered — by J.J. Thomson in 1897.
The cosmic inflation period — 10⁻³⁶ to 10⁻³² seconds after the Big Bang — expanded the universe by a factor of 10⁷⁸.
The Big Bang didn't happen at a point in space — space itself expanded from a state of extreme density.
Loop quantum gravity is a competing theory to strings — it suggests space itself is quantized at the Planck scale.
String theory proposes that all fundamental particles are vibrating strings of energy in 10 or 11 dimensions.
The four fundamental forces are gravity, electromagnetism, and the strong and weak nuclear forces.
Antimatter is real and produced in particle accelerators — a gram would release energy equivalent to a nuclear bomb.
The weak nuclear force is responsible for radioactive decay — without it, the Sun couldn't shine.
Every atom in your body was forged inside a star — you are literally made of stardust.
The uncertainty principle is not about measurement disturbance — it's a fundamental feature of nature.
Quantum mechanics is the most precisely tested theory in science — predictions match experiments to 12 decimal places.
The Higgs field permeates all of space — particles acquire mass by interacting with it.
Time is not constant — it passes more slowly for fast-moving objects and in stronger gravity fields.
The speed of light is the ultimate speed limit — nothing with mass can reach it.
The WHO's campaign to eradicate Guinea worm disease has reduced cases from 3.5 million in 1986 to under 15 today.