Iron oxide, or rust, in its soil

Solar System Trivia Quiz: 10 Questions That Test What You Know

This solar system trivia quiz covers the Sun, the eight planets, their moons, the asteroid belt, the Kuiper Belt and the distant Oort Cloud. Ten questions bring names, facts and surprises from our cosmic neighborhood.

Start Solar System Trivia Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Count
How many planets are in the solar system?
Hottest
Which planet is the hottest?
Largest
Which is the largest planet?
Red
Why is Mars red?
Sideways
Which planet spins on its side?
Day
On which planet is a day longer than its year?
Sun
About how much of the solar system's mass is in the Sun?
Belt
Where is the main asteroid belt?
Winds
Which planet has the fastest winds?
Light
About how long does sunlight take to reach Earth?

Explanations: answer key for all 10 questions

Q1: How many planets are in the solar system?
Answer: Eight
Pluto was reclassified as a dwarf planet in 2006.
Q2: Which planet is the hottest?
Answer: Venus
Its thick carbon dioxide atmosphere traps heat, reaching about 465 °C.
Q3: Which is the largest planet?
Answer: Jupiter
More than 1,300 Earths could fit inside it.
Q4: Why is Mars red?
Answer: Iron oxide, or rust, in its soil
Dust storms can cover the whole planet.
Q5: Which planet spins on its side?
Answer: Uranus
A giant collision may have tipped it over.
Q6: On which planet is a day longer than its year?
Answer: Venus
Venus rotates very slowly, and backward.
Q7: About how much of the solar system's mass is in the Sun?
Answer: About 99.8%
Jupiter holds most of the rest.
Q8: Where is the main asteroid belt?
Answer: Between Mars and Jupiter
It contains millions of rocky bodies.
Q9: Which planet has the fastest winds?
Answer: Neptune
Winds reach over 2,000 km/h.
Q10: About how long does sunlight take to reach Earth?
Answer: About 8 minutes
Light travels about 150 million kilometers.

Solar System Trivia Quiz – Our Cosmic Neighborhood

The solar system formed about 4.6 billion years ago from a giant cloud of gas and dust. At its center is the Sun, a star holding almost all of the system's mass. Around it orbit eight planets, five recognized dwarf planets and countless moons, asteroids and comets.

The four inner planets, Mercury, Venus, Earth and Mars, are small and rocky. The outer planets, Jupiter, Saturn, Uranus and Neptune, are giants made mostly of gas and ice, with ring systems and dozens of moons each. Beyond Neptune lies the icy Kuiper Belt, home to Pluto.

Spacecraft have visited every planet, revealing volcanoes on Venus, ancient river valleys on Mars, storms on Jupiter and geysers on moons of Saturn. Scientists keep studying the solar system to understand how planets form and whether life might exist beyond Earth.

What This Quiz Teaches

This quiz is for students and space fans exploring the solar system.

How many planets there are
Which planet is hottest and largest
Why Mars is red
Where the asteroid belt is
How long sunlight takes to reach us

Did You Know?

Saturn would float in a giant bathtub.
Mercury has almost no atmosphere.
Jupiter's Great Red Spot is a giant storm.
Earth is the densest planet.
Voyager 1 is in interstellar space.