How did Hubble know that the galaxies he observed were moving away from us? aThe spectra of the stars were red-shifted which indicates they were moving away rapidly. bThe spectra of the stars were blue-shifted which indicates they were moving away rapidly. cThe spectra of the stars were violet-shifted which indicates they were moving away rapidly. dThe spectra of the stars were green-shifted which indicates they were moving away rapidly.
Question
How did Hubble know that the galaxies he observed were moving away from us? aThe spectra of the stars were red-shifted which indicates they were moving away rapidly. bThe spectra of the stars were blue-shifted which indicates they were moving away rapidly. cThe spectra of the stars were violet-shifted which indicates they were moving away rapidly. dThe spectra of the stars were green-shifted which indicates they were moving away rapidly.
Solution
The correct answer is a. The spectra of the stars were red-shifted which indicates they were moving away rapidly.
Here's the step by step explanation:
- Hubble observed the light coming from distant galaxies.
- He noticed that the light from these galaxies was shifted towards the red end of the spectrum. This is known as redshift.
- Redshift occurs when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
- In physics, this is an indication that the object is moving away from the observer.
- Therefore, Hubble concluded that the galaxies he observed were moving away from us.
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