Space: Cepheid variables are stars that pulsate periodically —…

Question

Did you know? Cepheid variables are stars that pulsate periodically — the pulsation time is directly related to their brightness. Henrietta Leavitt discovered this in 1908; it became the first reliable way to measure cosmic distances. Without Cepheids Edwin Hubble's discovery of the expanding universe would have been impossible.

Accepted Answer

Cepheid variables are stars that pulsate periodically — the pulsation time is directly related to their brightness. Henrietta Leavitt discovered this in 1908; it became the first reliable way to measure cosmic distances. Without Cepheids Edwin Hubble's discovery of the expanding universe would have been impossible.

Meer uit Ruimte · More from Space