About this quiz
Look up and test your knowledge of space. This astronomy basics quiz covers the planets, the Sun and Moon, stars, galaxies, gravity, and how we measure the vast distances of the universe. Every answer includes a plain-language explanation, making it a friendly introduction to space science for students and curious adults alike.
Before you start
Curious learners who want a compact knowledge refresh across core facts.
Recognize Mercury and explain the reasoning behind it.
10 explanation-backed questions in about 12 minutes.
A small map of the test
- 1Which planet is closest to the Sun?
- 2Which is the largest planet in our solar system?
- 3What is at the center of our solar system?
- 4Which planet is known as the 'Red Planet'?
- 5What is the name of Earth's only natural satellite?
- 6A 'light-year' is a unit that measures what?
Who this quiz is for
- Curious learners who want a compact knowledge refresh across core facts.
- Best for easy practice when you want explanations after every answer.
What you should understand afterward
- Recognize Mercury and explain the reasoning behind it.
- Connect Jupiter with the broader general knowledge & science topic.
- Use the answer explanations to identify weak spots before retaking the quiz.
Ideas this quiz checks
Mercury
Mercury is the closest planet to the Sun and the smallest planet in our solar system.
Jupiter
Jupiter is by far the largest planet in our solar system — so large that all the other planets could fit inside it with room to spare.
At the center of our solar system
The Sun, a star, sits at the center of our solar system, and its gravity holds the planets in orbit.
Mars
Mars is known as the Red Planet because of the iron oxide — essentially rust — that covers much of its surface, giving it a reddish appearance.
Name of Earth's only natural satellite
The Moon is Earth's only natural satellite.
Light-year
A light-year measures distance, not time — it is the distance that light travels in one year, about 9.5 trillion kilometres.
How to read your score
-
80–100%
Strong command
You understand most of the core ideas and can use the explanations to polish smaller gaps.
-
50–79%
Solid base
You know part of the topic, but the missed explanations are the highest-value review material.
-
0–49%
Review first
Treat this as a starting map: revisit the key concepts, then retake the quiz for a cleaner signal.
Recommended next steps
- Read the explanation for every missed question before starting another quiz.
- Review Mercury, then retake the quiz to check retention.
- Use the related general knowledge & science quizzes and articles to reinforce the same topic from another angle.
Instructions
- You have 12 minutes total to answer 10 multiple-choice questions.
- Choose an answer to lock it in. The runner immediately shows the correct answer and explanation.
- Use Hint when you want a nudge, or Skip to move forward without answering.
- Keyboard shortcuts: A-D answer, H hints, S skips, Enter/→ next, and ← previous.
- No signup required. Your progress is local to this quiz session.