SN 1994D (bright spot on the lower left), a Type Ia supernova within its host galaxy, NGC 4526

Explosions as cosmic yardsticks.

Type Ia supernovae peak near −19.3 on the magnitude scale, letting astronomers measure vast distances.

Supernova: Measuring The Universe

A detailed image of a supernova remnant showcasing intricate cosmic patterns and celestial beauty.

Why so reliable

They arise from similar white dwarfs reaching a critical state, with light powered by decaying nickel‑56 and cobalt‑56.

Supernova: Measuring The Universe

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