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Cosmology Essentials

Cosmology

A study of the origin, structure, and evolution of the universe.

astronomy physics space

12 Questions Medium Ages 13+ Sep 11, 2026

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About this Study Set

This study set covers Cosmology through 12 practice questions. A study of the origin, structure, and evolution of the universe. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 12 questions from the Cosmology Essentials study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which theory suggests that the universe began as an extremely hot and dense point approximately 13.8 billion years ago?

A Steady State Theory
B Big Bang Theory
C Nebular Hypothesis
D Cyclic Model

2 What is the primary component of the universe that acts as a repulsive force, causing the expansion of the universe to accelerate?

A Dark Matter
B Black Hole Radiation
C Dark Energy
D Neutrinos

3 Which element was the first and most abundant to form following the Big Bang?

A Helium
B Lithium
C Carbon
D Hydrogen

4 What is the faint, uniform glow detected in all directions of the sky, considered to be the 'afterglow' of the Big Bang?

A Cosmic Microwave Background
B Solar Wind
C Stellar Parallax
D Galactic Redshift

5 Which form of matter, which does not emit, absorb, or reflect light, is believed to provide the gravitational 'glue' that holds galaxies together?

A Antimatter
B Dark Matter
C Interstellar Dust
D Plasma

6 What do astronomers use to measure the speed at which distant galaxies are moving away from us?

A Redshift
B Parallax
C Light Echoes
D Apparent Magnitude

7 What is the name of the era during which the first stars and galaxies began to form, ending the 'Dark Ages' of the universe?

A Reionization Era
B Planck Epoch
C Inflationary Period
D Quark Era

8 According to the Big Bang theory, what was the state of the early universe in its first few moments?

A Cold and expanding
B Solid and static
C Extremely hot and dense
D Composed entirely of dark energy

9 Approximately what percentage of the total energy-mass content of the universe is composed of ordinary 'baryonic' matter?

A About 5 percent
B About 25 percent
C About 50 percent
D About 95 percent

10 What is the term for the maximum distance from which light could have traveled to an observer since the Big Bang?

A Parsec
B Light-year
C Observable Universe
D Event Horizon

11 Which of these objects provides evidence for the expansion of the universe by showing a shift towards longer wavelengths in their light spectrum?

A Nearby stars
B Distant galaxies
C Planets in our solar system
D The Moon

12 Which law states that the velocity at which a galaxy moves away from an observer is proportional to its distance from the observer?

A Kepler's Law
B Newton's Law
C Hubble's Law
D Einstein's Law

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