Beyond Earth
Looking up at the night sky leads us beyond Earth. This Class 6 Curiosity chapter introduces the Sun and the solar system, the eight planets, the Moon and why it seems to change shape, the stars and constellations, and how Earth's spin gives us day and night.
Learning objectives
- Describe the Sun and the solar system.
- Name the planets and their order.
- Explain the phases of the Moon.
- Explain day and night.
Key concepts
The Sun and the solar system
The Sun is a star — a huge ball of hot, glowing gas — at the centre of our solar system. Around it move eight planets, along with moons, asteroids and comets, all held by the Sun's pull. The Sun gives us the light and heat that make life on Earth possible.
The planets
In order from the Sun, the eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Each planet moves around the Sun in its own path called an orbit. Earth is the only planet known to support life, having air and water.
The Moon and its phases
The Moon is Earth's natural satellite, moving around the Earth. It has no light of its own and only reflects sunlight. As it moves, we see different lit portions, so its shape seems to change from a thin crescent to a full Moon and back — these are the phases of the Moon.
Stars, constellations, and day and night
Stars are distant suns that twinkle at night; patterns of stars are called constellations, such as the Saptarishi (Ursa Major). The Sun appears to rise and set because the Earth spins on its axis once a day, turning each part towards the Sun (day) and then away (night).
Key definitions
- Solar system
- The Sun together with the planets and other bodies moving around it.
- Orbit
- The fixed path along which a planet or moon moves.
- Satellite
- A body that moves around a planet, like the Moon around Earth.
- Constellation
- A recognisable pattern formed by a group of stars.
Solved examples
Q1. Is the Sun a star or a planet?
Solution: The Sun is a star.
Q2. What is the Moon to the Earth?
Solution: Its natural satellite.
Q3. Why do we have day and night?
Solution: Because the Earth spins on its axis, turning towards and away from the Sun.
Common mistakes to avoid
- Calling the Sun a planet (it is a star).
- Thinking the Moon makes its own light (it reflects sunlight).
- Believing the Sun actually moves around the Earth (the Earth spins).
- Confusing a star with a planet.
Beyond Earth — MCQ Quiz
10 questions with instant feedback. Use number keys 1–4 to answer.
The Sun is a:
Practice questions
Short answer
What is at the centre of the solar system?
The Sun, which is a star.
What is the Moon?
Earth's natural satellite, which reflects sunlight.
Why do stars twinkle only at night?
They are distant suns whose faint light is seen against the dark night sky.
Long answer
Describe the solar system, including the Sun and the planets.
The solar system is the Sun together with all the bodies that move around it. At its centre is the Sun, which is a star — a huge ball of hot, glowing gas — whose pull holds everything in place and whose light and heat make life on Earth possible. Moving around the Sun are eight planets, in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Each travels along its own path called an orbit. Along with the planets there are moons, asteroids and comets. Earth is special as the only planet known to support life, with the air and water that living things need.
Explain the phases of the Moon and the cause of day and night.
The Moon is Earth's natural satellite and has no light of its own; it only reflects sunlight. As the Moon moves around the Earth, we see different amounts of its lit half, so its shape appears to change from a thin crescent to a half Moon to a full Moon and back again — these are the phases of the Moon. Day and night are caused by something different: the Earth spins on its axis once a day. The side of Earth facing the Sun has daytime, while the side turned away has night, and as the Earth keeps spinning, day and night follow one another everywhere.
HOTS (Higher Order Thinking)
If the Earth stopped spinning, what would happen to day and night on the side facing the Sun?
That side would have continuous daytime, because it would always face the Sun, while the other side would stay in night.
Why do we say the Moon does not 'shine' in the way the Sun does?
The Sun produces its own light as a star, but the Moon only reflects the Sun's light, so it is not a source of light itself.
Quick revision
Revision notes
- Sun = a star at the centre of the solar system; gives light and heat.
- Eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
- Moon = Earth's satellite; reflects sunlight; its phases change as it orbits.
- Day and night are caused by Earth spinning on its axis.
Key takeaways
- The Sun is a star; planets orbit it.
- The Moon reflects sunlight and shows phases.
- Earth's spin causes day and night.
Frequently asked questions
What is the solar system?
The Sun together with the planets and other bodies moving around it.
Why does the Moon change shape?
We see different lit parts of it as it orbits Earth — these are its phases.
What causes day and night?
The spinning of the Earth on its axis, turning each part towards and away from the Sun.