When a distant galaxy's light is redshifted, what does it tell us about the galaxy?, It is moving toward us, It is moving away from us, It is stationary, It is rotating faster, A star moves exactly perpendicular to our line of sight. What do we observe in its spectrum?, A strong redshift, A strong blueshift, No Doppler shift at all, A sudden change in brightness, According to classical physics, stars at the edges of a galaxy should move slower than inner stars. Observations show they move just as fast. What does this imply?, Classical physics is completely wrong, The galaxy is not rotating at all, There must be invisible mass holding the galaxy, The outer stars are much older, How did scientists conclude that the universe is expanding?, Redshift of galaxies, Blueshift of galaxies, Spectral broadening, None of the above

The Doppler effect

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