🌱Our Home, the Earth
The Earth is the planet we live on. It is just right for life:
- 💧 It has plenty of water — oceans, rivers and rain.
- 🌬️ It has air for living things to breathe.
- 🌡️ It is the perfect distance from the Sun — not too hot, not too cold.
The Earth is shaped like a giant ball (a sphere). From space it looks blue and green because of its water and land.
🤔 Vidi's Wonder Questions
Why is Earth called the 'blue planet'?
Because so much of Earth is covered in water — the oceans. From space, all that water makes the Earth look mostly blue, with green and brown land and white clouds.
Why can we live on Earth but not on the Moon?
Earth has air to breathe, water to drink and the right warmth. The Moon has no air or liquid water, so living things cannot survive there.
🤖 Vidi's Key Points
- Earth is the planet we live on, shaped like a ball.
- It has water, air and the right warmth for life.
- From space, Earth looks blue and green.
🐝Day and Night
The Earth is always spinning like a top. This spinning is called rotation, and it causes day and night.
- ☀️ The side of Earth facing the Sun has day.
- 🌙 The side facing away from the Sun has night.
- 🔄 Earth takes 24 hours (one day) to spin around once.
So the Sun does not really move across the sky — WE are moving, as the Earth turns!
🤔 Vidi's Wonder Questions
If Earth is spinning, why don't we feel it?
Earth spins very smoothly and we move along with it, so we cannot feel it — just like you don't feel a smooth train moving if you close your eyes.
Is it day everywhere at the same time?
No! When it is day on our side of Earth, it is night on the opposite side. As Earth spins, day and night travel around the world.
🤖 Vidi's Key Points
- Earth spins (rotates), causing day and night.
- The side facing the Sun has day; the other side has night.
- Earth takes 24 hours to spin around once.
☀️The Sun, Our Star
The Sun is a star — a giant ball of glowing hot gas. It only looks small because it is very, very far away.
- ☀️ The Sun gives Earth light and heat.
- 🌍 The Earth and other planets travel around the Sun.
- ⭐ The twinkling stars at night are other suns, even farther away.
🤔 Vidi's Wonder Questions
Is the Sun a star?
Yes! The Sun is a star, just like the ones that twinkle at night. It looks much bigger and brighter only because it is the closest star to us.
Why do other stars look so tiny?
Other stars are suns too, but they are millions of times farther away than our Sun. That huge distance makes them look like tiny twinkling dots.
🤖 Vidi's Key Points
- The Sun is a star — a huge ball of hot, glowing gas.
- It gives Earth light and heat.
- Night-time stars are other suns, much farther away.
💧The Moon and Its Phases
The Moon is Earth's neighbour in space. It travels around the Earth and does not make its own light — it reflects the Sun's light.
As the Moon moves around Earth, we see different amounts of its lit side. These shapes are called phases:
- 🌑 New Moon — we see no Moon.
- 🌒 Crescent — a thin sliver.
- 🌓 Half Moon — half lit.
- 🌕 Full Moon — a bright full circle.
🤔 Vidi's Wonder Questions
Does the Moon really change shape?
No — the Moon is always a round ball! We just see different amounts of its sunlit side as it travels around Earth. The shape we see is called its phase.
How long is one full set of Moon phases?
About one month! The Moon takes around 29 days to go through all its phases, from new moon back to new moon again.
🤖 Vidi's Key Points
- The Moon travels around Earth and reflects sunlight.
- We see phases: new, crescent, half and full Moon.
- The Moon is always round — only the lit part we see changes.
🍃The Solar System
The Solar System is the Sun and everything that travels around it. This includes eight planets, their moons, and smaller rocks.
- ☀️ The Sun is at the centre.
- 🪐 Eight planets orbit it: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
- 🔄 The path a planet takes around the Sun is called its orbit.
- 📅 Earth takes one year (about 365 days) to go around the Sun once.
🤔 Vidi's Wonder Questions
What is the difference between rotation and revolution?
Rotation is Earth SPINNING on its own (causing day and night). Revolution is Earth TRAVELLING all the way around the Sun (taking one year). Two different motions!
Which is the biggest planet?
Jupiter is the biggest planet in our Solar System — so huge that all the other planets could fit inside it! Earth is quite small next to giant Jupiter.
🤖 Vidi's Key Points
- The Solar System is the Sun and all that orbits it.
- Eight planets orbit the Sun, including Earth.
- Earth takes one year to revolve around the Sun once.
🧪 Try it at Home!
Be a Space Scientist — track the Moon and model day and night! 🌙
🧺 You will need
- A ball or an orange (for the Earth)
- A torch (for the Sun)
- A notebook and pencil
👣 Steps
- Make day and night: in a dim room, shine the torch (Sun) on the ball (Earth).
- See how one half of the ball is lit (day) and the other is dark (night).
- Slowly spin the ball — watch day and night move around it, just like Earth!
- Moon diary: each night for a week, look at the Moon and draw its shape.
- At the end, see how the Moon's phase slowly changed!
🎯 Mission Test
Ready, Science Explorer? Take the chapter test to show what you've discovered!
Start the Chapter Test →