How Did Edwin Hubble Measure the Distance to the Andromeda

question 36

Multiple Choice

How did Edwin Hubble measure the distance to the Andromeda Galaxy?

• A)He applied the period- luminosity relation to Cepheid variables in Andromeda.
• B)He measured its parallax.
• C)He detected white dwarf supernovae in Andromeda.
• D)He applied main- sequence fitting to star clusters in Andromeda.
• E)He measured its redshift and applied Hubble's Law.

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Definitions:

Sleep Spindles

Brief bursts of brain activity observed during stage 2 of non-REM sleep, associated with memory consolidation and learning.

EEG

Electroencephalography, a non-invasive method to record electrical activity of the brain used in medical and research settings to examine brain function.

REM Sleep

A unique phase of sleep characterized by rapid eye movement, during which vivid dreams commonly occur.

Quivering Eyelids

Involuntary, rapid movements or twitching of the eyelids.