Cepheid variable

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Cepheid variables

A region of the spiral galaxy M100 (bottom), with three frames (top) showing a Cepheid variable increasing in brightness. These images were taken with the Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST).

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Photos and Videos

Cepheid variables

A region of the spiral galaxy M100 (bottom), with three frames (top) showing a Cepheid variable increasing in brightness. These images were taken with the Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST).

How the big-bang theory was developed

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long-period variable star RR Lyrae star period-luminosity relation pulsating variable star

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star: Pulsating stars

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Edwin Hubble

Edwin Hubble

American astronomer

Harlow Shapley

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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

All About Astronomy