Explore 50 amazing facts about our solar system, deep space, and space exploration.
Space is full of enormous stars, strange planets, speedy spacecraft, and mysteries that scientists are still working to understand. These space facts for kids ages 8–10 explain some of the coolest discoveries in clear, kid-friendly language.
Read them in order, jump to a favorite topic, or use them for a classroom activity. When you're ready, test what you know with our free interactive Space quiz.
Start close to home with the star that powers our world and the planet beneath our feet.
Sunlight takes about 8 minutes and 20 seconds to travel from the Sun to Earth.
The Sun is so wide that about 109 Earths could fit side by side across its diameter.
The Sun holds about 99.8 percent of all the mass in our solar system.
Deep inside the Sun, hydrogen atoms join to make helium and release enormous amounts of energy.
The Sun's visible surface is about 5,500°C (10,000°F), but its outer atmosphere is much hotter.
Earth travels around the Sun at an average speed of about 107,000 kilometers (67,000 miles) per hour.
Earth's axis is tilted by about 23.5 degrees, and that tilt helps create our seasons.
Earth's magnetic field forms a protective region called the magnetosphere around our planet.
Earth's atmosphere does not end at a sharp line; it becomes thinner and thinner with height.
Auroras glow when energetic particles interact with gases high in Earth's atmosphere.
Our Moon is a rocky world with a long history written across its surface.
The Moon does not make its own light; moonlight is sunlight reflected from its surface.
The Moon is about 384,400 kilometers (238,855 miles) from Earth on average.
The Moon turns once in about the same time that it travels around Earth, so we usually see the same side.
The Moon's gravity helps produce ocean tides on Earth.
The Moon is slowly moving away from Earth by about 3.8 centimeters (1.5 inches) each year.
Dark patches on the Moon are ancient plains of cooled lava called maria, the Latin word for seas.
Bright lunar highlands are generally older and more heavily cratered than the Moon's dark plains.
Most scientists think the Moon formed after a young Earth collided with a Mars-sized world long ago.
The first people to walk on the Moon were Neil Armstrong and Buzz Aldrin during Apollo 11 in 1969.
Moon dust is made of tiny, sharp pieces of rock because there is no wind or water to smooth them.
Every planet is different, from speedy Mercury to windy Neptune.
A year on Mercury lasts only 88 Earth days.
Mercury has extreme temperatures because its thin exosphere cannot hold heat well.
Venus rotates in the opposite direction from most planets, so the Sun would appear to rise in the west there.
A day on Mars is about 24 hours and 39 minutes long, only a little longer than a day on Earth.
Sunsets on Mars can look blue near the Sun because fine dust scatters light differently than Earth's air does.
Try a free quiz made for kids ages 8–10. It includes 10 questions selected from a bank of 50 Space questions for that age group.
▶ Play the Ages 8–10 Space QuizMars has a canyon system called Valles Marineris that stretches for more than 4,000 kilometers (2,500 miles).
Jupiter rotates once in just under 10 hours, giving it the shortest day of any planet.
Jupiter's moon Ganymede is larger than the planet Mercury.
Saturn is the least dense planet; its average density is lower than the density of water.
Neptune has some of the fastest winds in the solar system, reaching more than 2,000 kilometers (1,200 miles) per hour.
Beyond our solar system lies a universe filled with stars, galaxies, and worlds we are still discovering.
A star's color gives clues about its temperature: blue stars are generally hotter than red stars.
Stars are giant spheres of superheated matter called plasma.
Our Sun is just one of hundreds of billions of stars estimated to be in the Milky Way.
The Andromeda Galaxy is about 2.5 million light-years away and is the nearest large galaxy to the Milky Way.
When telescopes look far into space, they also look back in time because light needs time to travel.
Astronomers call planets that orbit stars outside our solar system exoplanets.
The universe is expanding, which means very distant galaxies are generally moving farther apart.
A white dwarf can pack about as much mass as the Sun into a sphere roughly the size of Earth.
A neutron star can contain more mass than the Sun in a ball only about as wide as a city.
A meteorite is a piece of space rock that survives its trip through the atmosphere and reaches the ground.
Robots, rockets, telescopes, and astronauts help us investigate places humans cannot easily visit.
Rockets work in the vacuum of space by pushing exhaust in one direction, which pushes the rocket the other way.
A spacecraft can use a planet's gravity to change its speed and direction in a move called a gravity assist.
Spacesuits provide air and pressure while also protecting astronauts from harsh temperatures.
Astronauts can grow a little taller in space because the discs between the bones of the spine expand.
The International Space Station circles Earth about once every 90 minutes.
People aboard the space station can see about 16 sunrises and sunsets in one Earth day.
Voyager 1 is the farthest human-made object from Earth and is traveling through interstellar space.
Mars rovers act as robot geologists by studying rocks, soil, weather, and signs of ancient water.
Space telescopes can observe kinds of light that Earth's atmosphere blocks or partly absorbs.
Mission controllers on Earth track spacecraft, study their data, and send carefully timed instructions across space.
Try a free quiz made for kids ages 8–10. It includes 10 questions selected from a bank of 50 Space questions for that age group.
▶ Play the Ages 8–10 Space QuizWhat are some good space facts for kids ages 8–10?
Good space facts for this age explain big ideas in clear language, use memorable comparisons, and cover a mix of the Sun, Moon, planets, stars, and space exploration.
How many space facts are on this page?
This page contains exactly 50 space facts organized into five kid-friendly sections.
Are these space facts suitable for school projects?
Yes. These facts are written for ages 8–10 and reviewed against educational information from NASA and the European Space Agency. Students should still follow their teacher's rules for citing sources.
Can kids take a space quiz after reading the facts?
Yes. BrainQuest Trivia has a free 10-question Space quiz for ages 8–10, with questions selected from a bank of 50 for that age group and category.
Facts on this page were reviewed using kid-friendly and scientific information from these authoritative space organizations:
BrainQuest Trivia