Astronomy Facts
1 / 15How many planets are in our solar system?
About Astronomy Facts
Test your knowledge of the stars, planets, and cosmos! This free general knowledge activity is built for older adults who want clear, readable browser-based games without sign-up friction.
General knowledge games mix recall, reasoning, and pattern recognition to keep each round varied and mentally engaging. This quiz includes 15 questions, so it works well as a quick session or as part of a longer brain-training routine. A printable version is available if you prefer offline play or want to share the game at home, in a classroom, or in a group setting.
About Astronomy Facts
Astronomy Facts is a free general knowledge quiz with 15 multiple-choice questions with a mix of 5 easy, 5 medium, 5 hard questions. Test your knowledge of the stars, planets, and cosmos! A typical run takes about 7 minutes, hints are always one tap away, and your streak ticks up the first time you finish a game on a given day.
A few sample questions
1. Which planet is known as the 'Red Planet'?
Answer: Mars
Mars is called the Red Planet because of the iron oxide (rust) on its surface, which gives it a reddish appearance when viewed from Earth.
2. What is the closest star to Earth?
Answer: The Sun
The Sun is the closest star to Earth, at an average distance of about 93 million miles (150 million kilometers). The next closest star system is Alpha Centauri, about 4.37 light-years away.
3. How many planets are in our solar system?
Answer: 8
There are 8 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet in 2006.
Frequently asked questions
How many questions are in Astronomy Facts?
Astronomy Facts has 15 multiple-choice questions. Each one has four answer options and an explanation that appears after you answer, so you learn something even when you miss.
Is Astronomy Facts free to play?
Yes. The entire SeniorBrainGames catalog — including Astronomy Facts — is free, with no sign-up required, no time limits, and no ads on top of the game. It also works offline once the page has loaded once.
How long does Astronomy Facts take?
Most players finish Astronomy Facts in about 7 minutes. You can pause between questions, replay it as often as you like, and there is no penalty for taking your time — answers are explained after you submit them.
What's a good follow-up after Astronomy Facts?
If you enjoyed this general knowledge quiz, try the Daily Challenge — five rotating questions, refreshed every 24 hours, that count toward your streak. You can also use the Surprise Me button on the homepage to land on a different game type for variety.
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