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Questions and Answers
What is a standard ruler in astronomy?
What is a standard ruler in astronomy?
- An object whose intrinsic size is known (correct)
- A ruler used by astronomers for measurements
- A ruler that appears larger in space
- An imaginary ruler used for distance estimations
What did Hubble observe about the spectral lines of nearby galaxies?
What did Hubble observe about the spectral lines of nearby galaxies?
- They remained unchanged
- They were redshifted (correct)
- They were blueshifted
- They disappeared
What provides distance cues in astronomy based on apparent size?
What provides distance cues in astronomy based on apparent size?
- Apparent motion of planets
- Apparent brightness of stars
- Apparent size of a 'standard ruler' (correct)
- Apparent color of galaxies
What is the significance of the redshift in light waves from receding galaxies?
What is the significance of the redshift in light waves from receding galaxies?
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What did Hubble's measurement of redshift in galaxies contribute to?
What did Hubble's measurement of redshift in galaxies contribute to?
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