Milestones in Observational Cosmology

Cosmology

This set of questions explores significant historical discoveries and observations that shaped our understanding of the universe.

history observation Big Bang redshift

8 Questions Medium Ages 12+ Apr 6, 2026

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About this Study Set

This study set covers Cosmology through 8 practice questions. This set of questions explores significant historical discoveries and observations that shaped our understanding of the universe. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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1 What key observation by Edwin Hubble in the late 1920s provided strong evidence for the expansion of the universe?

A The detection of the Cosmic Microwave Background radiation
B The measurement of the redshift of distant galaxies
C The discovery of dark matter in galactic halos
D The observation of gravitational lensing around massive objects

2 The Cosmic Microwave Background (CMB) radiation, a cornerstone of the Big Bang model, was accidentally discovered in 1964 by:

A Carl Sagan and Frank Drake
B Albert Einstein and Georges Lemaître
C Arno Penzias and Robert Wilson
D Vera Rubin and Kent Ford

3 Which astronomer is credited with proposing the 'Steady State' theory of the universe in the mid-20th century as an alternative to the Big Bang?

A Fred Hoyle
B Georges Lemaître
C Arthur Eddington
D Hubble

4 The first direct detection of gravitational waves, predicted by Einstein's theory of General Relativity and a significant cosmological event, was announced in 2016 by which collaboration?

A The Event Horizon Telescope
B The Hubble Space Telescope Science Institute
C The Laser Interferometer Gravitational-Wave Observatory (LIGO)
D The Sloan Digital Sky Survey

5 Georges Lemaître, in the late 1920s, is recognized for proposing what foundational concept in cosmology?

A The existence of black holes
B The Big Bang theory (initially called the 'hypothesis of the primeval atom')
C The theory of cosmic inflation
D The discovery of dark energy

6 The 'Great Debate' of 1920, held at the Mount Wilson Observatory, primarily addressed the nature of:

A The origin of the Milky Way galaxy
B The composition of the Sun's atmosphere
C The distance and nature of spiral nebulae (whether they were within or outside our galaxy)
D The presence of life on other planets

7 What celestial phenomenon, first widely observed and cataloged by Charles Messier in the late 18th century, represented early attempts to map and understand the universe beyond our immediate solar neighborhood?

A Comets
B Asteroids
C Nebulae and star clusters
D Planetary transits

8 The work of Vera Rubin and Kent Ford in the 1970s provided compelling observational evidence for the existence of what invisible component of galaxies?

A Neutrinos
B Dark Matter
C Cosmic Rays
D Protoplanetary Disks

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