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katrin2010 [14]
3 years ago
10

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

Physics
1 answer:
alekssr [168]3 years ago
4 0
<span>The physical principle used by Edwin Hubble to demonstrate that the "spiral nebulae" are very distant and large was the inverse-square law of light. The Cepheid variable stars in the spiral nebulae obey a period-luminosity relation; by measuring the period of a Cepheid star, its average luminosity can be determined, and then, by comparing this with its average apparent brightness, its distance can be calculated.</span>
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