Chapter-Chapter 12. Beyond Earth Science Curiosity class 6 in english Medium CBSE Notes

Chapter 12. Beyond Earth

These CBSE Notes – Key Points are prepared according to the latest NCERT Curiosity textbook and the latest CBSE competency-based pattern. They provide a quick revision of important concepts, scientific terms, celestial objects, and the Solar System covered in this chapter.

CBSE Notes – Key Points

These notes are useful for quick revision before examinations. Read the important definitions, keywords, tables, and scientific facts carefully to strengthen your understanding of the chapter.

Important Keywords

The following keywords are frequently used in this chapter and should be remembered carefully.

Keyword	Meaning
Astronomy	The scientific study of celestial objects and the Universe.
Celestial Body	A natural object found in space.
Star	A self-luminous ball of hot gases.
Planet	A celestial body that revolves around the Sun.
Satellite	A body that revolves around a planet.
Constellation	A group of stars forming a recognizable pattern.
Galaxy	A huge collection of stars, gas, dust, and planets.
Asteroid	A small rocky body revolving around the Sun.
Comet	An icy celestial body that develops a tail near the Sun.
Astronomical Unit (AU)	The average distance between the Earth and the Sun.

Important Facts About Stars

Stars are enormous celestial bodies that produce their own heat and light.

• The Sun is the nearest star to Earth.
• Stars appear to twinkle because of Earth's atmosphere.
• Stars are much larger than planets.
• Different stars have different brightness.
• Stars are extremely far away from Earth.

Constellations

Constellations are groups of stars that appear to form fixed patterns in the night sky.

Constellation	Special Feature
Orion	Known as The Hunter.
Ursa Major	Contains the Big Dipper pattern.
Ursa Minor	Contains the Pole Star.

Pole Star

The Pole Star appears almost fixed in the northern sky and is useful for finding directions.

• Also called Polaris.
• Known as Dhruva Tara in India.
• Helps identify the north direction.
• Used for navigation since ancient times.

The Sun

The Sun is the centre of the Solar System and the ultimate source of energy for Earth.

Feature	Description
Type	Star
Position	Centre of the Solar System
Main Function	Provides heat and light
Importance	Supports all life on Earth

The Solar System

The Solar System consists of the Sun and all celestial bodies that revolve around it.

• Sun
• Eight planets
• Natural satellites
• Asteroids
• Comets
• Dwarf planets

Order of the Planets

The planets are arranged according to their distance from the Sun.

Order	Planet	Nickname
1	Mercury	Nearest to the Sun
2	Venus	Morning/Evening Star
3	Earth	Blue Planet
4	Mars	Red Planet
5	Jupiter	Largest Planet
6	Saturn	Planet with Rings
7	Uranus	Ice Giant
8	Neptune	Farthest Planet

Stars and Planets

Stars and planets differ in several important ways.

Stars	Planets
Produce their own light.	Reflect sunlight.
Appear to twinkle.	Usually do not twinkle.
Very hot.	Comparatively cooler.
Made mainly of hot gases.	Rocky or gaseous bodies.

Asteroids and Comets

Asteroids and comets are small celestial bodies found in the Solar System.

Asteroids	Comets
Rocky objects.	Made of ice, dust, and rocks.
Mainly found between Mars and Jupiter.	Develop a bright tail near the Sun.

Galaxy and Universe

Our Solar System is a tiny part of the Milky Way Galaxy, which itself is only one among billions of galaxies in the Universe.

• The Milky Way is our home galaxy.
• The Universe contains billions of galaxies.
• Each galaxy contains millions or billions of stars.

Light Pollution

Excessive artificial lighting reduces the visibility of stars in the night sky.

• Makes astronomical observations difficult.
• Reduces the number of visible stars.
• Dark places are better for sky watching.

Important Scientific Terms

Remember these scientific terms for examinations.

Scientific Term	Meaning
Polaris	The Pole Star.
Milky Way	Our home galaxy.
Orbit	The fixed path followed by a planet or satellite.
Celestial Object	Any natural object present in space.
Light Pollution	Excess artificial light affecting sky observation.

Important Facts

Remember these facts for examinations.

• The Sun is the nearest star to Earth.
• Earth is the only known planet that supports life.
• Mercury is the nearest planet to the Sun.
• Neptune is the farthest planet from the Sun.
• Jupiter is the largest planet.
• Saturn is famous for its rings.
• The Moon is Earth's natural satellite.
• Most asteroids are found between Mars and Jupiter.
• Comets develop a tail when they approach the Sun.
• The Milky Way is our home galaxy.

Quick Revision

Revise the following points before your examination.

• Astronomy is the study of celestial objects.
• Stars produce their own light.
• Planets reflect sunlight.
• Constellations help identify regions of the sky.
• The Pole Star indicates the north direction.
• The Solar System has eight planets.
• Asteroids are rocky bodies.
• Comets develop bright tails near the Sun.
• The Milky Way contains our Solar System.
• The Universe is made up of billions of galaxies.

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