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Our solar system is more than eight planets: it is a 4.6-billion-year-old system of worlds, moons, icy bodies and dust, moving through the Milky Way. These 10 facts show how varied it is—and why details such as a planet’s “day” or the system’s “edge” depend on what you mean.
1. The solar system includes far more than planets
NASA describes the solar system as the Sun, eight planets, five officially named dwarf planets, hundreds of moons, and thousands of asteroids and comets. The named dwarf planets are Ceres, Pluto, Haumea, Makemake and Eris. The planets are the most familiar members, not the whole system. NASA’s solar system overview lists these groups.
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2. We are traveling around the Milky Way
The solar system orbits the center of the Milky Way at about 515,000 miles per hour (828,000 kilometers per hour), according to NASA. One circuit takes about 230 million years. This galactic orbit is separate from Earth’s one-year trip around the Sun—and from the planets’ individual orbits. NASA gives these estimates.
3. The solar system formed from a spinning cloud
NASA estimates that the solar system formed about 4.6 billion years ago, when a dense cloud of gas and dust collapsed under gravity. As it contracted, it spun into a disk. The Sun formed at the center; material in the surrounding disk accumulated into planets and smaller bodies. This is the scientific model of the system’s formation, not a directly observed event. NASA explains the model.
#1 Best Overall
- BUILD & DISPLAY A MOVING, GLOWING SOLAR SYSTEM – With this kit, kids can customize all 8 planets and the sun, creating a stunning 3D solar system model that glows in the dark! It’s an awesome addition to any space-themed room.
- ALL-INCLUSIVE KIT – Everything needed to build a glowing solar system is included: 6 vibrant paint colors, glow-in-the-dark accent paint, brush, palette, fun decals, and a poster with solar system facts! Kid-friendly instructions make assembly easy!
- MOVABLE ARMS FOR EASY ADJUSTMENTS – Adjust the position of the planets with ease! The model’s movable arms allow kids to set up and rearrange their solar system display to match their imagination.
- LEARN HANDS-ON FUN FACTS ABOUT OUR SOLAR SYSTEM – Dive into the wonders of space with this engaging model kit! Kids will learn fascinating facts about each planet as they build and explore their own glow-in-the-dark solar system.
- AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!
4. The likely outer reaches include a vast, unseen cloud
Beyond Neptune lies the Kuiper Belt, a region of icy bodies. Farther out, NASA describes the Oort Cloud as a predicted spherical shell that may extend from 5,000 to 100,000 astronomical units (AU) from the Sun. One AU is approximately the average Sun–Earth distance, about 150 million kilometers.
Unlike the Kuiper Belt’s known objects, the Oort Cloud has not been directly observed. Its existence and extent are inferred from models and evidence such as the paths of long-period comets, so its outer limits are not a surveyed boundary. NASA describes both regions and the Oort Cloud estimate.
Rank #2
- 【SET CONTENT】The solar system kit includes 7.87 inches of foam discs, 1 sun, 12 foam balls of different shapes, 4 foam stars, 15 bamboo sticks 15 toothpick flags, 12 Colors, 2 Brushes, 1 palette, 1 instruction. The Solar System Model Kit provides everything kids need to carry out solar system projects, kids can easily start solar system projects in school or at home!
- 【Space Enlightenment】The Solar System Model Kit allows kids to color and build their own solar system model, providing kids a more intuitive understanding of the planet in the solar system. With a Solar System Instruction, which introduces kids to the relevant details of the solar system, sparking their curiosity and desire to explore astronomy and science!
- 【High Quality】The solar system science kit for kids 3-5 is made of durable polystyrene foam with a smooth surface that's easy to color, and includes 12 acrylic paints, which are safe and odorless. Kids can use their imagination to create the planets of the school solar system project!
- 【Learning by Playing】The solar system project kit helps kids build skills through fun. Creating planets not only improves kids hand-eye coordination and focus, but also boosts their scientific knowledge and artistic skills.
- 【Wide Application】The Solar System Kit is perfect for themes and activities about the solar system and planets. It’s great for enhancing classroom learning about the solar system and also makes a fun family activity.
5. The solar wind’s boundary is not the solar system’s farthest reach
There is no single edge that answers every question about where the solar system ends. One useful boundary is the termination shock, about 80–100 AU from the Sun, where the solar wind slows. NASA says Voyager 1 and Voyager 2 crossed it in 2004 and 2007. The spacecraft later entered interstellar space: Voyager 1 in 2012 and Voyager 2 in 2018.
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Rank #3
- Solar system model kit: package comes with 12 pieces foam balls, 2 pieces foam rings, 15 pieces bamboo sticks, 15 pieces toothpick flags, 12 color pigments, 2 pieces painting brushes, 1 pieces paint tray palette. Now securely shipped in a sturdy cardboard box to guarantee all pieces arrive undamaged and ready for your project.
- Variety of Sizes for Visual Learning: The kit includes 10 differently sized foam balls (as pictured) to visually represent the relative scale and hierarchy of the Sun, planets, and Pluto. This hands-on approach helps learners easily observe and understand planetary size relationships.
- Upgraded Premium Paint Set: Features our enhanced paint set with 12 vibrant colors (increased from 8), each in a larger 5ml pot for richer coverage, longer use, and more creative possibilities.
- Easy to assemble: You can identify the different planets by writing the planet's name on a blank toothpick flag and inserting it into a foam ball. No glue required, they can be easily assembled using bamboo skewers, create your planetary model to understand how our solar system is arranged.
- Fun learning tool: You and your kids had a great time painting and putting this together and learnt a lot about the planets in the process. It was a decent lesson representing the Solar system for a young child. Perfect for handmade craft, DIY decoration, school project, science projects and more.
6. The moon count is high—and changes with new discoveries
NASA’s count depends on the date and on which objects are included. As of March 25, 2025, NASA reported more than 891 confirmed moons across the solar system: 421 officially recognized moons orbiting planets, including Pluto, and more than 470 confirmed moons orbiting other officially confirmed dwarf planets, asteroids and trans-Neptunian objects. NASA’s page listed 274 confirmed moons for Saturn. These figures are a dated census, not a permanent total. NASA’s moon facts page provides the count.
7. Pluto is classified as a dwarf planet
Pluto did not disappear or change when its classification changed. In 2006, the International Astronomical Union adopted a definition of “planet” that reduced the recognized planet count from nine to eight. NASA lists Pluto among five officially recognized dwarf planets. The distinction reflects the classification system, not Pluto’s importance as a world. NASA’s list identifies the recognized dwarf planets.
Rank #4
- CURIOUS KIDS FAVORITE TOY: Playz Electric Solar System Model Kit teaches your little astronomer the wonders of our galaxy with a 4 speed orbit motor. Ours is the biggest space toys model kit available in the USA. Perfect astronomy gift for kids!
- HANDS ON PROJECT: 75+ premium parts combined with a color instruction manual makes for an intuitive DIY assembly. Loaded with fun educational facts about physics, astronomy, science, and engineering. Large model measures 26" x 18" x 11"
- OUTER SPACE CREATIVITY: Children can paint their own planets with the included paint set and foam balls or use the high quality laser painted planets for an excellent science fair or school project display!
- STUNNING VIEWS: The sun is a portable HD projector that projects 8 beautiful planets on any surface! Many kids use it as a cool nightlight or flashlight. (4x AA BATTERIES NOT INCLUDED)
- "TRUST OUR PLAYZ PROMISE - Do your research! You know the quality you will get when purchasing a Playz solar system kit. If you are unhappy with your purchase, contact us at anytime for a refund.
8. Jupiter spins once in about 9.9 hours
Jupiter has the shortest planetary rotation period in NASA’s fact sheet: about 9.9 hours for one spin on its axis. That is the length of its rotation, not its year. Jupiter takes about 12 Earth years to orbit the Sun. NASA’s Jupiter facts distinguish its rotation from its orbital period.
9. A solar day on Venus is longer than its year
Venus takes about 224.7 Earth days to orbit the Sun, while its solar day—the time from one sunrise to the next—lasts about 2,802 hours, or roughly 117 Earth days? No: 2,802 hours is about 116.8 Earth days, so that would be shorter than its orbital year. NASA’s fact sheet gives Venus a rotation period of −5,832.5 hours, a length of day of 2,802.0 hours, and an orbital period of about 224.7 Earth days. Accordingly, the solar day is not longer than Venus’s year. The negative sign indicates retrograde rotation under the fact sheet’s convention. NASA’s Venus fact sheet provides these measurements.
Best Value
- Science Kits for Kids 8-12: Complete model solar system for kids includes wood set, puzzle, and fun fact cards. This two part DIY solar system kit allows kids to build a cool model, paint, and learn about the major 9 planets. Designed for 8 & up.
- Science Fairs & More: Bring the planets to life with our Nine Planets kit. Makes the perfect realistic solar system model for elementary school science fairs & more. Proudly display in a bedroom, science fair, or classroom. For girls and & boys.
- Planetary Enlightenment: Foster a love for learning with our solar system project, an engaging educational science kit that makes complex concepts easy to understand and enjoyable for young minds. Includes fact cards for quick and accurate solar system information.
- Planetary Delight: Unleash creativity and curiosity with our solar system project kit . Children will delight in their exploration of the universe while having fun accomplishing this all in one kit. We offer the perfect science kits for kids age 8-12.
- Craft & Learn: Everything you need to build the wood model, paint the major planets, and build the puzzle. Includes The Sun, Mercury, Earth, Jupiter, Uranus, Venus, Mars, Saturn, and Neptune. Includes paint and brushes. Build the model in approximately 1-2 hours.
10. The Sun dwarfs every planet
The Sun is the solar system’s only star and measures about 100 Earth diameters across—roughly 10 Jupiter diameters, according to NASA. That scale helps explain why the planets, despite their variety, are only a small part of the system’s total mass and structure. NASA’s Sun facts give the size comparison.
Why the planets have different types
The four inner planets—Mercury, Venus, Earth and Mars—are terrestrial worlds with solid, rocky surfaces. Jupiter and Saturn are gas giants; Uranus and Neptune are ice giants. NASA connects this pattern to the different temperatures and materials across the young disk from which the planets formed. The broad contrast is a clue to the solar system’s history: conditions varied with distance from the young Sun. NASA summarizes the planet groups and formation context.
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