Explainer
What Is Dark Energy?
Dark energy is a name for an observation, not an explanation of it. The observation is that cosmic expansion is speeding up, and the whole question is whether the thing…
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Dark Energy
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Explainer
How Do We Know How Bright a Supernova Was?
Type Ia supernovae are the rulers cosmology uses to measure the expanding universe, and they are usually called standard candles, as if they all shone equally brightly. They do not.…
Explainer
What Is the Hubble Tension?
Measure how fast the universe is expanding using the afterglow of the Big Bang, and you get one number. Measure it using nearby stars and exploding suns, and you get…
Explainer
Nineteen numbers, seventeen particles, one theory that will not break
The theory rests on nineteen numbers no one can derive from anything deeper, and it has survived every test aimed at it, including the two anomalies that were supposed to…
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