Family astronomy · Hands-on learning
Explore the Solar System: A 3D Activity for Kids
Children can make sense of space by moving between worlds, asking questions, and explaining what they notice. Vastonaut is a free, browser-based 3D Solar System explorer that families and educators can use as a starting point for a short astronomy activity.
A simple 15-minute Solar System activity
- Start with the Sun. Open Vastonaut and identify the Sun. Ask what kinds of objects orbit it.
- Visit the planets in order. Follow Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Say each name before moving to the next world.
- Compare planet groups. Discuss the rocky inner planets—Mercury, Venus, Earth, and Mars—and the giant planets in the outer system. What looks different?
- Choose a moon or dwarf planet. Visit Earth's Moon or a destination such as Europa, Titan, Ceres, or Pluto. Talk about how moons and dwarf planets differ from the eight planets.
- Finish with a question. Explain one discovery, one thing that is still puzzling, and one fact to check in a trusted science source.
Questions to ask while exploring
Which planet is closest to the Sun?
Review the sequence and point to Mercury in the interactive view.
Which world is our home?
Find Earth and the Moon. Ask what makes a moon different from a planet.
Are all planets alike?
Compare rocky worlds with giant planets and notice differences in their appearance.
Why is Pluto a dwarf planet?
Talk about the categories astronomers use and how dwarf planets fit into the Solar System.
Is the model drawn to exact scale?
No. Vastonaut compresses sizes and distances to make navigation possible on a screen.
How far away is the Moon?
The Moon is about 384,400 kilometres (238,855 miles) from Earth on average. Its distance changes during its orbit.
Help children distinguish a model from reality
An interactive scene helps show locations and relationships, but it is not a measured map. If every planet used its true relative diameter and orbital spacing, most planets would be too small to inspect in one screen view. Vastonaut therefore compresses visual distances, sizes, and orbital timing for exploration. Do not use screen spacing to calculate real distances.
When a new question comes up, use a trusted astronomy reference to check the answer. NASA's planet guide, Moon facts, and Solar System facts are good places to continue.
Tips for families and educators
- Keep the goal small: one concept, such as planet order or the difference between a planet and a moon.
- Ask the learner to predict what they will see before selecting a destination.
- Let the learner operate the controls or use Projector Mode for a shared-screen discussion.
- Ask them to explain the model in their own words rather than just memorizing a list.
- Use the guided Earth-to-Moon mission to begin a discussion about distance and light-travel time.
Quick memory check
Try answering from memory before opening each answer. Recalling an idea helps it stick better than rereading alone.
1. Which star is at the center of our Solar System?
Answer: The Sun. Its gravity keeps the planets in orbit.
2. Why do planets look much closer together in the 3D explorer?
Answer: The model compresses distances so you can navigate the Solar System on a screen. The displayed spacing is not to scale.
3. Is the Moon a planet or a natural satellite?
Answer: A natural satellite. It orbits Earth.