Galaxies were originally called "Spiral Nebulae". Their true
nature was first appreciated when:
a.) The Cosmic Microwave Background was discovered
b.) Newton developed his theory of gravity
c.) Hubble measured the distance to the Andromeda Galaxy
d.) Galileo disproved the Geocentric Model
Galaxies were originally called "Spiral Nebulae". Their true nature was first appreciated when: a.) The Cosmic Microwave
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