Chapter 1
🪐
Planets & Stars
Meet our Sun, the worlds around it, and learn what stars are made of.
Mission 1
⭐
What is a Star?
Meet your first star
Discover what stars really are, what they're made of, and how they shine.
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Mission 2
🎨
Star Colors & Temperature
Hot blue, cool red
Discover how a star's color helps astronomers estimate its surface temperature.
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Mission 3
🔭
Distance & Brightness
Light years across the sky
Discover how astronomers measure cosmic distances and how brightness changes with distance.
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Mission 4
☀️
The Sun is a Star
Our closest star
Meet our own friendly star — the Sun — and the amazing things it does.
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Mission 5
✨
Why Do Stars Twinkle?
The dance of starlight
Find out why stars twinkle and planets don't — it's all about Earth's atmosphere.
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Mission 6
🪐
Planets & Our Solar System
Eight worlds orbiting one star
Tour the planets of our Solar System and learn what makes each world unique.
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Mission 7
💡
Variable Stars
Stars that change
Meet stars that pulse, flicker, and swap brightness — the universe's heartbeats.
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Mission 8
🌈
Star Classes (O B A F G K M)
The seven star families
Master the seven spectral classes and see where every star belongs.
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