Our Solar System
Learning Objectives
- Know what the solar system is.
- Name the eight planets in order from the Sun.
- Learn a fun fact about each planet.
- Learn about the Sun and the Moon.
- Know about India's space achievements (ISRO, Chandrayaan, Mangalyaan).
Let Us Begin!
Have you ever looked up at the night sky and seen the stars and the Moon? Our Earth is just one small part of a huge family called the Solar System.
The Solar System has the Sun at the centre, and eight planets going around it. Our Earth is the third planet from the Sun. It is the only planet where life exists!
India has its own space agency called ISRO (Indian Space Research Organisation) that sends rockets and satellites into space. India has even sent missions to the Moon and Mars!
☀️ The Sun
The Sun is a huge ball of hot, glowing gas at the centre of our Solar System. It gives us light and heat. Without the Sun, there would be no life on Earth.
- The Sun is so big that about 1.3 million Earths could fit inside it!
- It takes 8 minutes for sunlight to reach Earth.
- The Sun is about 150 million kilometres away from Earth.
- The Sun is a star — the closest star to Earth.
- The surface of the Sun is about 5,500°C hot!
🪐 The Eight Planets
The eight planets go around the Sun in a path called an orbit. Here they are in order from the Sun:
| Order | Planet | Fun Fact |
|---|---|---|
| 1st | Mercury | Smallest planet and closest to the Sun. Very hot in the day (430°C) and very cold at night (−180°C)! |
| 2nd | Venus | Brightest planet in our sky. Called the "Morning Star" or "Evening Star." Hottest planet because of thick clouds. |
| 3rd | Earth | Our home! The only planet with water, air, and life. Called the "Blue Planet" because of its oceans. |
| 4th | Mars | Called the "Red Planet" because its soil is red. India's Mangalyaan spacecraft visited Mars in 2014! |
| 5th | Jupiter | The largest planet — 1,300 Earths could fit inside it! Has a giant storm called the Great Red Spot. |
| 6th | Saturn | Has beautiful rings made of ice and rock. It is so light that it could float on water! |
| 7th | Uranus | Spins on its side like a rolling ball! Appears blue-green in colour. |
| 8th | Neptune | Farthest planet from the Sun. Has the strongest winds in the solar system — up to 2,000 km/hour! |
🌙 The Moon
The Moon is Earth's natural satellite. It goes around the Earth. The Moon does not have its own light — it reflects light from the Sun.
- The Moon is about 384,000 km from Earth.
- In 1969, American astronaut Neil Armstrong became the first human to walk on the Moon.
- The Moon has no air, no water, and no life.
- We can see craters (big holes) on the Moon's surface.
- The Moon looks different each night — these shapes are called phases (new moon, half moon, full moon).
- India's Chandrayaan-3 successfully landed on the Moon's south pole in 2023! 🇮🇳
🌟 Amazing Space Facts
- A day on Venus is longer than a year on Venus!
- Jupiter has at least 95 moons!
- Saturn's rings are made of billions of pieces of ice and rock.
- There is no sound in space because there is no air.
- Astronauts float in space because there is very little gravity.
- One year on Neptune is equal to 165 Earth years!
🇮🇳 India in Space — ISRO
India's space agency is called ISRO (Indian Space Research Organisation). ISRO has done amazing things:
| Mission | What It Did |
|---|---|
| Chandrayaan-1 (2008) | India's first mission to the Moon. Found water on the Moon! |
| Mangalyaan (2014) | India's mission to Mars. India became the first country to reach Mars on its very first try! |
| Chandrayaan-3 (2023) | Successfully landed on the Moon's south pole. India became the 4th country to land on the Moon! |
Key Words
| Word | Meaning |
|---|---|
| Solar System | The Sun and all the planets, moons, and other objects that go around it |
| Planet | A large round object that goes around the Sun |
| Orbit | The path a planet takes as it goes around the Sun |
| Satellite | An object that goes around a planet (the Moon is Earth's natural satellite) |
| Star | A ball of hot, glowing gas in space (the Sun is a star) |
| ISRO | Indian Space Research Organisation — India's space agency |
- The Solar System has the Sun at the centre and 8 planets going around it.
- The planets in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
- Earth is the 3rd planet and the only one with life. It is called the "Blue Planet."
- Mars is called the Red Planet. Jupiter is the largest. Saturn has rings.
- The Sun is a star. It gives us light and heat.
- The Moon goes around the Earth and reflects the Sun's light.
- India's ISRO sent Chandrayaan to the Moon and Mangalyaan to Mars.
Practice Questions
| Planet / Object | Fact |
|---|---|
| 1. Mars | a. Largest planet |
| 2. Saturn | b. Red Planet |
| 3. Jupiter | c. Has beautiful rings |
| 4. Earth | d. Closest star to Earth |
| 5. Sun | e. Blue Planet |
Draw the Solar System! Draw the Sun in the middle. Then draw 8 circles around it for the planets. Label each planet. Colour Earth blue and green (water and land). Colour Mars red. Add Saturn's rings!
Which planet would you most like to visit? Why?
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