Grade 2 (age 7-8)

Space Adventure

Look up at the night sky and you see shining stars and the Moon, all out in space. Our Earth is one of eight planets that circle a big star called the Sun. From the Sun outward come Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, each with its own size and look. Here you can pick each planet and tour the solar system to see what makes it special.

Let's Explore the Solar System!

Choose Planet2 Earth

🚀 What is the Solar System?

①8 planets orbit around the Sun

②Order: Mercury → Venus → Earth → Mars → Jupiter → Saturn → Uranus → Neptune

③Earth is the 3rd planet!

Each Planet is Unique!

☀️ The Sun — Source of All Energy

①Sun is a "star" (shines on its own), not a planet

②Extremely hot (surface ~5,500°C!)

③Thanks to the Sun, Earth has light and warmth

🌍 Earth — Our Special Home

①Has water → life can exist

②Atmosphere protects us

③We have one friend — the Moon

🪐 Fun Planet Facts

①Jupiter is so big 1,300 Earths could fit inside!

②Saturn is so light it would float in water

③Mars has a mountain 3x taller than Mt. Everest

④Neptune has winds at 2,000 km/h!

Summary

🎯 Space Adventure Summary

①Solar System = Sun + 8 planets

②Memorize: Mer-Ven-Ear-Mar-Jup-Sat-Ura-Nep

③Only Earth has water and air → life

④Space is vast and mysterious — want to learn more?

Examples and Unit Test

Example 1

Name the 8 planets of the solar system in order from nearest the Sun. Which number is Earth?

In order of nearness: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Earth is the third planet from the Sun.

▸ Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune / Earth = third

Saying the planets in order makes their order easy to remember.

Example 2

Is the Sun a planet or not? Why do you think so?

The Sun is a star that shines on its own.

A planet cannot shine on its own and goes around the Sun, so the Sun is not a planet.

▸ The Sun is not a planet but a star that shines on its own

Thanks to the Sun, the Earth has light and warmth.

Unit Test

Which is the third planet from the Sun?

①Mercury

②Venus

③Earth

④Mars

⑤Jupiter

▸ ③ Earth

In order of nearness to the Sun: Mercury, Venus, Earth.

So the third planet is Earth, where we live.

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Earth, Our Home

How Machines Work