MARVELS OF THE SKY || UNIT 6 || EXTRA QUESTIONS

Sun is a star.

 

 sun is the biggest and hottest star. 

 

Sun gives us heat and light.

 

 

 Sun is the centre of the solar system.

 

 Without sun life on Earth is not possible 

Important Points About

  the Moon

 

The Moon is the natural satellite of the Earth.

 

The Moon does not have its own light; it reflects sunlight.

 

 

The Moon revolves around the Earth.

 

 

It takes about 27 days to go around the Earth once.

 

 

The Moon rotates and revolves in the same time, so we always see the same side of the Moon.

 

 

The Moon has no air and no water.

 

 

The Moon’s surface has many craters and mountains.

 

 

The Moon causes tides in oceans on Earth.

 

 

The Moon’s shape appears to change; these are called phases of the Moon.

 

 

Humans first landed on the Moon in 1969 July 21 - Moon day

Earth is a planet. 

 

Earth is the only planet exists life.

 

Earth revolves around the sun. 

 

Blue planet. 

8 Planets

Mercury – ബുധൻ

Venus – ശുക്രൻ

Earth – ഭൂമി

Mars – ചൊവ്വ

Jupiter – വ്യാഴം

Saturn – ശനി

Uranus – യൂറാനസ്

Neptune – നെപ്റ്റ്യൂൺ

 Easy tip to remember

 

My Very Educated Mother Just Served Us Noodles

Mercury (ബുധൻ)

 

Closest planet to the Sun

 

Smallest planet

 

No atmosphere

 

No natural satellite (0 moons)

 

Takes 88 days to go around the Sun

 

 

 

 Venus (ശുക്രൻ)

 

Hottest planet

 

Similar in size to Earth

 

Rotates opposite direction

 

No natural satellite (0 moons)

 

Takes 225 days to go around the Sun

 

 

 

🌍 Earth (ഭൂമി)

Only planet with life

 

Has air, water, and land

 

One natural satellite – Moon

 

Takes 365 1/4 days (1 year) to go around the Sun

 

Called the Blue Planet

 

 

 

 

 Mars (ചൊവ്വ)

Called the Red Planet

Has mountains and valleys

Two natural satellites – Phobos & Deimos

Takes 687 days to go around the Sun

 

 

 Jupiter (വ്യാഴം)

 

Biggest planet

 

Made of gas

 

Has a big red spot (storm)

 

Many satellites (95+ moons)

 

Takes 12 years to go around the Sun

 

 

 

 Saturn (ശനി)

 

Famous for its beautiful rings

Second biggest planet

Made of gas

Many satellites (140+ moons)

Takes 29 years to go around the Sun

 

 

 

 Uranus (യൂറാനസ്)

Rotates lying on its side

Very cold planet

Has faint rings

27 natural satellites

Takes 84 years to go around the Sun

 

 

 Neptune (നെപ്റ്റ്യൂൺ)

Farthest planet from the Sun

Very windy and cold

Appears blue in color

14 natural satellites

Takes 165 years to go around the Sun

⭐ Quick Revision Points

 

Smallest planet: Mercury

 

Biggest planet: Jupiter

 

Planet with life: Earth

 

Planet with rings: Saturn

 

Red Planet: Mars

Largest satellite in the solar system ganymede.(Jupiter)

 

Largest satellite of Neptune triton

Titan is the large satellite of Saturn.

Rotation 

Rotation means spinning in the same place.

Earth rotates on its own axis.

Rotation causes day and night.

Earth takes 24 hours (1 day) to complete one rotation.

 

 

 

Revolution

 

Revolution means moving around the sun.

Earth revolves around the Sun.

 

Revolution causes seasons.

 

Earth takes 365 1/4 days (1 year) to complete one revolution.

Moon rotates on its axis.

Moon revolves around the Earth.

Moon takes about 27 days for both rotation and revolution.

Solar System

 

The Solar System is made up of the Sun, 8 planets, moons, asteroids, and comets.

The Sun is at the centre of the Solar System.

All planets revolve around the Sun.

The Sun gives light and heat to all planets.

Phases of the Moon – Main Points

 

The phases of the Moon are the different shapes of the Moon seen from Earth.

 

These phases occur because the Moon revolves around the Earth.

The Moon does not have its own light; it reflects sunlight.

 

As the Moon moves, the sunlit part we see changes, causing phases.

 

There are 8 main phases of the Moon.

One lunar month is about 29½ days (29 days and 12 hours). 

 

One lunar month is the time taken by the Moon to complete all its phases.