Weekly Space Quiz — Week 21, 2026
Astronomy and spaceflight, ten questions per week. Ten questions, instant scoring, and a written answer key with explanations below.
The weekly space quiz for week 21, 2026 is a free 10-question multiple-choice quiz covering astronomy, solar system, spaceflight. Play it interactively on this page or read the full answer key below — no sign-up needed.
Play the Space quiz for week 21, 2026
About this week's edition
Space is the rare subject where the facts genuinely outdo imagination. This weekly round covers the solar system, deep space astronomy, and the history and present of human spaceflight.
The golden age of space quizzing is now: reusable rockets, space telescopes, and lunar programs generate new material constantly, while the classics — Apollo, Voyager, Hubble — never stop being asked.
Scale is a recurring theme. Several questions each month exist purely to recalibrate your sense of how big, how far, and how old the universe actually is.
How to play
- Read each question and tap one of the four options.
- The correct answer is highlighted immediately, with a one-line explanation.
- Your running score appears in the bar above the questions.
- Answer all ten to see your final result and verdict.
Scoring guide
| Score | Verdict |
|---|---|
| 9–10 | Expert — you could set next week's questions. |
| 7–8 | Strong — comfortably above the typical player. |
| 5–6 | Average — the most common band for this round. |
| 0–4 | Warm-up — read the explanations and replay. |
Answer key — Space quiz, 2026 · WK 21
Prefer to read rather than play? Open each question below to reveal the answer and the reasoning.
Q1. The Sun is classified as what type of star?
Yellow dwarf (G-type main sequence)
The Sun is a G-type main-sequence star, roughly halfway through its ~10-billion-year life.
Q2. Which planet has the most moons confirmed to date?
Saturn
Saturn overtook Jupiter after waves of discoveries, with well over 140 confirmed moons.
Q3. Who was the first human in space?
Yuri Gagarin
Soviet cosmonaut Yuri Gagarin orbited Earth aboard Vostok 1 on 12 April 1961.
Q4. The unicorn is the national animal of which country?
Scotland
Scotland adopted the unicorn — a medieval symbol of purity and power — as its national animal.
Q5. How many planets are in our solar system?
Eight
Since Pluto's 2006 reclassification as a dwarf planet, the solar system officially has eight planets.
Q6. Olympus Mons, the solar system's tallest volcano, is on which planet?
Mars
Olympus Mons on Mars rises about 22 km — nearly two and a half times Everest's height above sea level.
Q7. How many bones does an adult human body typically have?
206
Babies are born with around 300 bones, many of which fuse; adults typically end up with 206.
Q8. Which metal is liquid at room temperature?
Mercury
Mercury melts at about −39°C, making it the only metal that is liquid under ordinary room conditions.
Q9. What is a light-year a measure of?
Distance
A light-year is the distance light travels in one year — about 9.46 trillion kilometres.
Q10. Which planet rains diamonds, according to models?
Neptune (and Uranus)
Extreme pressure inside the ice giants likely compresses carbon into diamond 'rain' — supported by lab experiments.
FAQs — Space, 2026 · WK 21
Can screen-reader users play the Space quiz?
Yes. Options are real buttons, results are announced via live regions, and every visual cue has a text equivalent.
Is the Weekly Space Quiz free to play?
Yes — every quiz on this site is free, requires no account, and stores no personal data. Your score is calculated in your browser and never leaves it.
Who writes and checks the Space questions?
The Weekly Quiz editorial process requires every answer to be verifiable against at least two reliable reference sources before publication — see our fact-checking policy.
What is a good score on the Space quiz for week 21, 2026?
Six out of ten is a solid pass, eight or more puts you well above the typical player, and a perfect ten is genuinely uncommon on this edition.
Is there a harder version of this quiz?
Yes — the Weekly Challenge Quiz collects the toughest questions across all categories into one expert round each week.
Where can I find older Space quizzes?
The weekly quiz archive lists every past edition by ISO week, and each quiz page links to the previous and next week at the bottom.
How is this different from last week's Space quiz?
The question selection, option order, and mixed-in bonus questions all rotate weekly, so the week 21, 2026 edition is a distinct set from the week before.
Does the Space quiz work on mobile?
Yes — the quiz is a lightweight static page that works on any modern phone browser, with large tap targets and no app required.
Are the questions multiple choice?
Yes, every question offers four options with exactly one correct answer — the format that works best for quick weekly play and fair scoring.
How many questions are in this week's Space quiz?
Ten. Six are drawn from the Space question set and four are mixed in from neighbouring categories, so every weekly edition plays differently.
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