Question 10: the correct answer is Saturn. Got it right? Score 1 point.
Your round
Add up the points from the 10 answers.
Space is vast, and there is always something to learn. Reread the explanations and try again another day.
You got the basics right. The questions on records and history are the ones that trip people up most.
You know the Solar System well. Only the hardest details slipped past you.
Almost everything right. It's worth reading the curiosities to discover even more.
Just for fun. The bands describe how this round went, not you.
Why, for question 10: Which planet has the largest number of known moons?
The answer is Saturn. In March 2025, astronomers confirmed 128 new moons, bringing the total to 274. Jupiter, which once led this count, had 95 known moons at the same time.
Moons of every size
Most of Saturn's new moons are small, only a few kilometres across, and were found with large telescopes that combine many images to reveal faint objects. Many are likely fragments of larger moons that broke apart in collisions.
Saturn's largest moon, Titan, is bigger than the planet Mercury and has a dense atmosphere, with lakes of liquid methane and ethane on its surface.
Another moon, Enceladus, shoots jets of water vapour and ice from its south pole, coming from an ocean hidden beneath its crust. It is one of the places in the Solar System where scientists look for conditions suitable for life.
Our Moon is the fifth largest in the Solar System and, among the eight planets, it is the largest moon relative to the size of the planet it orbits.
What this quiz covered
Questions 1, 2, 3, 4, 8 and 10 were about the planets: the red one, the largest, how many there are, the closest to the Sun, the hottest, and the one with the most moons. In record questions, pay attention to the criterion: the closest to the Sun is not the hottest.
Questions 6 and 7 dealt with our place in the Universe and with distances, including the Milky Way and the time sunlight takes to reach us.
Questions 5 and 9 were about the history of space exploration: the first crewed flight and the landing on the Moon. Anyone who wants to go further will find more facts like these in the list of space curiosities.
Where this information comes from: NASA; International Astronomical Union (dwarf planets, 2006, and Saturn's moons, 2025); Brazilian Space Agency (Marcos Pontes).
