Solar System Facts
1 / 15Planets, moons, and solar system knowledge
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Which planet in our solar system is the largest?
About Solar System Facts
Solar System Facts is a free general knowledge quiz with 15 multiple-choice questions with a mix of 8 medium, 7 easy questions. Planets, moons, and solar system knowledge 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 in our solar system is the largest?
Answer: Jupiter
Jupiter is the largest planet in our solar system. It has a diameter of about 86,881 miles (139,822 km) — more than 11 times the diameter of Earth. You could fit over 1,300 Earths inside Jupiter.
2. How many officially recognized planets are in our solar system?
Answer: 8
There are 8 officially recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet by the International Astronomical Union in 2006.
3. 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 distinctive reddish appearance visible even from Earth with the naked eye.
4. Which moon in our solar system is the largest?
Answer: Ganymede (Jupiter)
Ganymede, a moon of Jupiter, is the largest moon in the solar system. With a diameter of about 3,273 miles (5,268 km), it is even larger than the planet Mercury.
5. What is Saturn's most distinctive feature?
Answer: Its extensive ring system
Saturn is famous for its spectacular ring system, which is made up of billions of particles of ice, rock, and dust ranging in size from tiny grains to house-sized chunks. The rings span up to 175,000 miles wide.
Things you'll learn along the way
- Light from the Sun takes approximately 8 minutes and 20 seconds to reach Earth, traveling at 186,000 miles per second across the roughly 93-million-mile distance between the two.
- Uranus has an extreme axial tilt of about 98 degrees, essentially rolling around the Sun on its side. Scientists believe a massive collision early in its history may have knocked it sideways.
- The Great Red Spot is a persistent anticyclonic storm on Jupiter that has been observed for at least 350 years. It is so large that Earth could fit inside it, with winds reaching 400 mph.
Frequently asked questions
What's a good follow-up after Solar System 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.
Can I print Solar System Facts?
Yes — use the Print button at the top of the page for a clean question sheet, or "Print with Answers" to make an answer key. Printed sheets work well for group play at home, in a classroom, or at a senior center.
Will I lose my progress if I close the page?
Your overall progress — XP, streaks, and badges — is saved in your browser automatically. A quiz that's underway restarts if you leave mid-game, but at about 7 minutes, Solar System Facts fits comfortably in one sitting.
How many questions are in Solar System Facts?
Solar System 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.
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