A large system of stars, gas, dust, and dark matter bound together by gravity

Matter that does not emit, absorb, or reflect light, but has gravitational effects

Cosmology: Our Universe's Story

Cosmology

Explore the fundamental nature of the universe, its origins, evolution, and ultimate fate through the lens of cosmology, focusing on concepts accessible to young learners.

universe big bang galaxies stars planets

12 Questions Medium Ages 13+ Jul 18, 2026

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About this Study Set

This study set covers Cosmology through 12 practice questions. Explore the fundamental nature of the universe, its origins, evolution, and ultimate fate through the lens of cosmology, focusing on concepts accessible to young learners. 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: Our Universe's Story study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the dominant theory describing the origin and evolution of the universe?

A The Steady State Theory
B The Big Bang Theory
C The Oscillating Universe Theory
D The Multiverse Theory

2 What is the name given to the faint, uniform glow of radiation that permeates all of space and is considered evidence for the Big Bang?

A Cosmic Microwave Background Radiation
B Starlight
C Gravitational Waves
D Dark Energy

3 What force is primarily responsible for the formation of stars and galaxies?

A Electromagnetism
B The Strong Nuclear Force
C Gravity
D The Weak Nuclear Force

4 Approximately how old is the universe, according to current cosmological models?

A 1 billion years
B 4.5 billion years
C 13.8 billion years
D 100 billion years

5 What is a galaxy?

A A single, large star
B A large system of stars, gas, dust, and dark matter bound together by gravity
C A type of black hole
D A small planet orbiting a distant star

6 Our solar system is located in which galaxy?

A Andromeda Galaxy
B Triangulum Galaxy
C Milky Way Galaxy
D Whirlpool Galaxy

7 What is dark matter?

A A type of luminous gas in space
B Matter that does not emit, absorb, or reflect light, but has gravitational effects
C The core of a dying star
D A theoretical particle responsible for dark energy