Science·Space Exploration·conceptual
The Vast Scale of Space
Describe the scale of the universe in nested layers: Earth is one planet in our solar system, the Sun is one star among billions in the Milky Way galaxy, and the Milky Way is one galaxy among billions in the universe
Suggested ages 9–11
Learning journey
Your child is discovering the wonders of space — learning about stars, planets, and galaxies, understanding how our ideas about the solar system have changed over time, and exploring humanity's journey into space.
Evidence of understanding
- State that the Milky Way is our galaxy and it contains billions of stars
- Explain the hierarchy: planet → solar system → galaxy → universe
- Use a comparison to convey cosmic scale (e.g. if the Sun were a football, Earth would be a peppercorn 26 metres away)
Assessment prompt
Can The Vast Scale of Space describe how our place in the universe works — that we’re on a planet in a solar system in a galaxy among billions of galaxies?
Standards alignment
No external standards are linked to this topic.