Question

What was the physical principle used by Edwin Hubble to demonstrate that the "spiral nebulae" are very distant and large?

   What was the physical principle used by Edwin Hubble to demonstrate that the "spiral nebulae" are very distant and large?

The Cosmos: Astronomy in the New Millennium

The Cosmos: Astronomy in the New Millennium

Jay M. Pasachoff;… 5th Edition

Chapter 16, Problem 2

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Edwin Hubble observed that the "spiral nebulae" (now known as galaxies) exhibited a redshift in their spectra. This means that the light emitted by these objects was shifted towards longer wavelengths, indicating that they were moving away from us. Show more…

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What was the physical principle used by Edwin Hubble to demonstrate that the "spiral nebulae" are very distant and large?

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