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# class 8 social science chapter 17 question answer assamese medium

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## Class 8 Science Chapter 17 Notes

In class 8 Science chapter 17 stars and the solar system, the various celestial bodies embodied in the solar system along with the chapter important questions ae discussed.

CBSE NotesCBSE Notes For Class 8Class 8 Science NotesChapter 17: Stars And The Solar System

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## Stars And The Solar System Class 8 Notes - Chapter 17

The planets, the stars, the moon and other bodies in the sky are known as celestial bodies. Astronomy is a branch of science that studies celestial bodies and the associated phenomena. The change in the shape of the moon every day is one of the observations of celestial bodies that we can make. The day on which the whole disc of the moon is visible is known as the full moon day, while the day on which only a small portion of the moon is visible is known as the new moon day. Various shapes of the bright part of the moon seen during a month are known as the phases of the moon. The phases of the moon occur as we can only see the part of the moon that reflects the light of the Sun towards us.

## Phases of the Moon

### Moon and it’s different phases

– The various shapes of the illuminated part of the moon as seen from the earth are called as the phases of the moon. The cycle is about 29 days, where it goes from a full moon to a new moon to a full moon.

### Understanding phases of moon

– The moon does not produce its own light but reflects the light of the Sun. As the moon revolves around the earth, different parts of its surface get illuminated and we see a different shape every day.

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## The Dark Side of the Moon

The part of the moon that always faces away from the earth is called the dark side of the moon.

The moon’s time period for rotation on its axis and revolution around the earth is approximately the same. (≈ 27.3 days). Therefore an observer always sees the same face of the moon from earth.

### For More Information On Dark Side of Moon, Watch The Below Video:

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## Surface of the Moon

The surface of the moon is barren and dusty and devoid of water. It has many large craters and high mountains.

The moon’s gravity is 6 times weaker than earth’s. It is so weak that it does not have any atmosphere. That is why we cannot hear on the surface of the moon.

To know more about Moon, visit here.

## Stars

Stars are celestial bodies that emit their own light and heat. Our sun is an example of a star.

Although stars are always present in the sky but are only visible at night due to the absence of sunlight.

They appear as points as they are millions of kilometres away from us. Stars twinkle as their light gets refracted in our atmosphere.

The position of stars keeps changing as seen from the earth’s surface, apart from the Polestar whose position is fixed.

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### Pole star

The Pole star (or Polaris) is one star whose position seems to be fixed. All other stars seem to move around the Pole Star.

It can be traced using the constellation Ursa Major.

### Light year

The distance travelled by light in one year is called a light year. It is a measure of distance for celestial objects.

Speed of light $$= 3 \times 108 m/s$$

1 light year $$= 9.46 \times 1012 km$$

The sun is 8 light minutes away from earth.

The distance of Alpha Centauri is 4.3 light years away.

To know more about Light year, visit here.

## Constellations

A group of stars that form a recognisable shape in the night sky is called as a constellation. They were devised by ancient men for navigation purposes.

Examples: Ursa major (Great bear), Orion, Leo major

To know more about Constellations, visit here.

## Introduction to the Solar System

### Celestial Objects

– A naturally occurring physical object in the cosmos, outside earth’s atmosphere, is called a celestial body. E.g: Sun, moon

### The Solar System

The sun and all other planets and celestial bodies that revolve around it are together called as a solar system. Our solar system has 8 planets and an asteroid belt. Pluto is considered as a dwarf planet.

स्रोत : byjus.com

## Tamilnadu Class 8th Social Science Chapter

Get the Tamil versions of the Tamilnadu Class 8 Textbooks of Social Science Chapter - 17 (Civics) to prepare for the exams. We provide books of Term - 1 here.

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## Tamilnadu Class 8th Social Science Chapter - 17 (Civics) Textbook Tamil Medium

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## Tamilnadu Board Class 8th Social Science Chapter - 17 (Civics) Textbooks

Subject Matter Experts at selfstudys have created Tamil Nadu State Board 8th Class Social Science Chapter - 17 (Civics) Book Answers Solutions Guide Pdf Free Download are part of Samacheer Kalvi 8th Books Solutions.

Access Tamil Nadu Board Class 8 Text Book PDF

Tamilnadu Class 8 Social Science Chapter - 17 (Civics) Textbooks help students to prepare most efficiently for the board exams and ace it. Here, you can find the new study materials 2020-21 Edition of Samacheer Kalvi Tamil Nadu State Board Syllabus for 8th Class Social Science Chapter - 17 (Civics) Textbooks for English Medium students. We have provided the Social Science Chapter - 17 (Civics) books in Tamil Medium for Term wise. These Samacheer Kalvi Class 8th Textbooks are devised by subject Wise matter experts and use very simple and easy to understand language. These Tamil Nadu Class 8 Social Science Chapter - 17 (Civics) textbooks are used to explain all the key concepts of the subject thoroughly with the help of examples and exercises.

Let us look at these Tamilnadu State Board New Syllabus pdf, Samacheer Kalvi 8th Standard Social Science Chapter - 17 (Civics) Guide Pdf of Text Book Back Questions and Answers Term 1, 2, 3, Chapter Wise Important Questions papers, Study Material, Question Bank, Notes, Formulas and revise our understanding of the subject.

स्रोत : www.selfstudys.com

## NCERT Book Class 8 Science Chapter 17 Stars and the Solar System

NCERT Book for Class 8 Science Chapter 17 Stars and the Solar System is available for reading or download on this page. Students who are in Class 8 or

## NCERT Book Class 8 Science Chapter 17 Stars and the Solar System

by aglasemAugust 5, 2022

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NCERT Book for Class 8 Science Chapter 17 Stars and the Solar System is available for reading or download on this page. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy.

Here you can read Chapter 17 of Class 8 Science NCERT Book. Also after the chapter you can get links to Class 8 Science Notes, NCERT Solutions, Important Question, Practice Papers, etc. Scroll down for Stars and the Solar System from NCERT Book Class 8 Science Book & important study material.