Tag: supernovae

How We Know the Distance to a Star: Climbing the Cosmic Distance Ladder One Rung at a TimeParallax, Cepheids and Type Ia supernovae form a three-rung ruler. We build each rung from the inverse-square law, find the distance to δ Cephei, and track how errors accumulate.PhysicsCosmologyHigh school / generalcosmology distance measurement parallax Cepheid variables supernovae~30 min

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