A friendly warm-up. Great for all ages and family game night.
This space in order quiz mixes up the rules each round. Sometimes you'll line up planets from closest to the Sun to farthest, sometimes from smallest to largest, and sometimes you'll put famous space missions in date order. It's a friendly warm-up for anyone who loves the night sky, and a great family quiz for testing who really remembers their solar system.
Our solar system is so big that its numbers stop meaning much. One helpful trick is to shrink everything down. If the Sun were the size of a front door, Earth would be about the size of a nickel, and the outer planets would be scattered across a whole town. Distances grow much faster than most people expect as you head outward, which is why the inner planets feel crowded together and the outer ones feel lonely.
Planets also split neatly into two families. The four inner planets are small and rocky, with solid surfaces you could stand on. The four outer planets are giants made mostly of gas or ice, and any one of them dwarfs the rocky worlds. Keeping those two groups in mind makes many size and distance questions much easier.
When it comes to missions, think in chapters. The early space race of the late 1950s and 1960s focused on getting people and satellites into orbit and reaching the Moon. Later decades brought reusable spacecraft, long-term living in orbit, robot explorers on other worlds and powerful space telescopes. Read each round's rule carefully, because the order changes from one round to the next.
Closest to the Sun first
Answer: Mercury (36 million mi), then Earth (93 million mi), then Jupiter (484 million mi), then Uranus (1.8 billion mi)
Sunlight takes about 8 minutes to reach Earth but around 2 hours and 40 minutes to reach Uranus.
Smallest to largest (by diameter)
Answer: Mercury (3,032 mi), then Mars (4,212 mi), then Earth (7,918 mi), then Saturn (72,367 mi)
Mars is only about half as wide as Earth, even though both are rocky planets.
Earliest to latest
Answer: Sputnik 1 launches (1957), then Apollo 11 lands on the Moon (1969), then Hubble Space Telescope launches (1990), then James Webb Space Telescope launches (2021)
The James Webb Space Telescope launched on Christmas Day 2021.
Smallest to largest (by diameter)
Answer: The Moon (2,159 mi), then Earth (7,918 mi), then Jupiter (86,881 mi), then The Sun (865,000 mi)
About 109 Earths could fit side by side across the face of the Sun.
Earliest to latest
Answer: Yuri Gagarin becomes first human in space (1961), then First Space Shuttle launch (1981), then First International Space Station module launches (1998), then Perseverance rover lands on Mars (2021)
Gagarin's historic flight lasted under two hours and circled Earth just once.
Shortest year to longest
Answer: Mercury (88 days), then Earth (365 days), then Mars (687 days), then Jupiter (About 12 Earth years)
The farther a planet is from the Sun, the longer and slower its trip around it.