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Cosmology Foundations

Cosmology

An introduction to the structure, components, and scale of the universe.

space astronomy universe science

12 Questions Medium Ages 8+ Apr 3, 2026

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About this Study Set

This study set covers Cosmology through 12 practice questions. An introduction to the structure, components, and scale 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 Foundations study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which of these is the term for a massive system that contains billions of stars, gas, and dust held together by gravity?

A Galaxy
B Planet
C Asteroid
D Moon

2 What is the name of the spiral galaxy that contains our Solar System?

A Andromeda
B Milky Way
C Triangulum
D Sombrero

3 Which force is primarily responsible for holding stars and planets together in their orbits?

A Magnetism
B Electricity
C Gravity
D Friction

4 What is a star mostly made of in terms of its chemical composition?

A Hydrogen and Helium
B Oxygen and Nitrogen
C Iron and Nickel
D Carbon and Silicon

5 What do astronomers call the center point around which our planets orbit?

A The Moon
B The Sun
C The Earth
D The North Star

6 Which of these celestial objects is a giant ball of burning gas that produces its own light?

A Planet
B Moon
C Star
D Comet

7 How long does it take for the Earth to complete one full orbit around the Sun?

A 24 hours
B 30 days
C 12 months
D 10 years

8 What is the primary difference between a planet and a star?

A Size only
B Color only
C Stars produce light while planets reflect it
D Planets are always larger

9 What term describes the collection of all space, time, matter, and energy?

A The Galaxy
B The Universe
C The Solar System
D The Atmosphere

10 Which unit of measurement is used to measure the vast distances between stars and galaxies?

A Kilometers
B Light-years
C Miles
D Centimeters

11 What is a 'lunar eclipse' caused by?

A The Sun passing between Earth and the Moon
B The Moon passing between Earth and the Sun
C The Earth passing between the Sun and the Moon
D The Moon stopping its rotation

12 Which of the following is considered a 'natural satellite' of the Earth?

A The International Space Station
B The Moon
C Mars
D An Asteroid

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