How was Earth's Moon most likely formed?

From debris after a giant impact

Planetary Moons Trivia Quiz – Names, Facts and Surprises

This planetary moons trivia quiz visits Earth's Moon, Jupiter's Io, Europa and Ganymede, Saturn's Titan and Enceladus, Neptune's Triton and Mars's tiny moons. Ten questions bring names, facts and surprises from the moons of the solar system.

Start Planetary Moons Trivia Quiz

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

Question 1 / 10 Time: 150s

Largest
What is the largest moon in the solar system?
Volcanoes
Which moon is the most volcanically active body in the solar system?
Ocean
Which Jupiter moon may hide a salty ocean under its ice?
Atmosphere
Which moon has a thick atmosphere and methane lakes?
Geysers
Which Saturn moon shoots water geysers into space?
Backward
Which large moon orbits backward around its planet?
Mars
What are Mars's two moons called?
Galileo
Who discovered Jupiter's four largest moons in 1610?
Earth
How was Earth's Moon most likely formed?
Death Star
Which Saturn moon has a huge crater that makes it look like the Death Star?

Explanations: answer key for all 10 questions

Q1: What is the largest moon in the solar system?
Answer: Ganymede
It is bigger than the planet Mercury.
Q2: Which moon is the most volcanically active body in the solar system?
Answer: Io
Jupiter's gravity squeezes and heats it.
Q3: Which Jupiter moon may hide a salty ocean under its ice?
Answer: Europa
NASA's Europa Clipper launched in 2024 to study it.
Q4: Which moon has a thick atmosphere and methane lakes?
Answer: Titan
Huygens landed there in 2005.
Q5: Which Saturn moon shoots water geysers into space?
Answer: Enceladus
Cassini flew through its plumes.
Q6: Which large moon orbits backward around its planet?
Answer: Triton
It may be a captured Kuiper Belt object.
Q7: What are Mars's two moons called?
Answer: Phobos and Deimos
Their names mean fear and dread.
Q8: Who discovered Jupiter's four largest moons in 1610?
Answer: Galileo Galilei
They are called the Galilean moons.
Q9: How was Earth's Moon most likely formed?
Answer: From debris after a giant impact
A Mars-sized body likely hit early Earth.
Q10: Which Saturn moon has a huge crater that makes it look like the Death Star?
Answer: Mimas
The crater Herschel is about 130 km wide.

Planetary Moons Trivia Quiz – Worlds Around Worlds

The solar system has hundreds of known moons, from Earth's familiar Moon to tiny captured asteroids. Most belong to the giant planets: Jupiter and Saturn each have about a hundred or more known moons, and new ones are still being discovered.

Some moons are worlds in their own right. Ganymede is larger than Mercury, Titan has a thick atmosphere with methane rain and lakes and Io is covered in active volcanoes. Europa and Enceladus probably hide liquid water oceans beneath their icy crusts.

Because of these oceans, scientists consider icy moons among the best places to search for life beyond Earth. Missions like Europa Clipper, JUICE and the planned Dragonfly to Titan will explore them in the coming years.

What This Quiz Teaches

This quiz is for space fans exploring planetary moons.

Which moon is largest
Which moon has volcanoes
Which moons may hide oceans
What Titan is like
How our Moon formed

Did You Know?

Saturn has the most known moons.
Venus and Mercury have no moons.
The Moon is drifting away about 3.8 cm a year.
Callisto is heavily cratered.
Pluto's moon Charon is half its size.