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2026
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Source-derived question
What was the Great Debate of 1920, and what were the two competing views of the Andromeda nebula?
Cosmic Microwave Background
Galaxies and Large-Scale Structure
Sources that address it
Edwin Hubble proves existence of other galaxies
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Related questions
How did polarised galactic dust end up mimicking the signature of primordial gravitational waves?
What later astronomical discoveries grew out of the field of radio astronomy that Jansky's antenna founded?
Why did the small temperature anisotropies detected in 1992 matter for explaining how galaxies formed?
Why was the nature of the Andromeda nebula such a contested question in 1913?
Why were the tiny temperature fluctuations COBE detected so significant for understanding galaxy formation?
How cold is the afterglow of the Big Bang today, and why has it cooled so much?
How did Edwin Hubble use Leavitt's relation to prove the Andromeda nebula lay outside the Milky Way?
How did Genzel and Ghez track individual stars to prove something massive and invisible sits at the centre of the Milky Way?