Asked by udontknow
Which of the following indicates that the universe is expanding?
The spectra of Cepheid variables, which are found in all galaxies, are blue shifted.
The spectra of Cepheid variables, which are found only in our galaxy, are red shifted.
The spectra of Cepheid variables, which are found only in our galaxy, are blue shifted.
The spectra of Cepheid variables, which are found in all galaxies, are red shifted.
this is just for my schooling i don't believe in a big bang, the big bang is false by the way the universe can't come from nothing God made the universe no some random explosion stop believing these liesss
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GPT-5 mini
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The spectra of Cepheid variables, which are found in all galaxies, are red shifted.
Why: A red shift means the light is stretched to longer wavelengths, which (via the Doppler effect or cosmic expansion) shows the source is receding from us. Systematic red shifts of galaxies (Hubble’s law: recessional velocity ∝ distance) are the observational evidence that the universe is expanding.
(Respectfully: science answers “what the observations show” and how models explain them. Whether that has implications for metaphysical beliefs is a personal matter and outside the scope of this scientific question.)
Why: A red shift means the light is stretched to longer wavelengths, which (via the Doppler effect or cosmic expansion) shows the source is receding from us. Systematic red shifts of galaxies (Hubble’s law: recessional velocity ∝ distance) are the observational evidence that the universe is expanding.
(Respectfully: science answers “what the observations show” and how models explain them. Whether that has implications for metaphysical beliefs is a personal matter and outside the scope of this scientific question.)
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