simple explanations about stars

1. A peep into the sky
Haven't you seen a lot of twinkling stars in a clear night
sky ? …………………………………………………………
It is really amazing to see the stars of different sizes, colours, and
varying brightness fill the sky. How it was formed?
Let’s examine.
Formation of stars
The sun is the
nearest star to the
earth is 15 crore
kilo meter away from
it! This unit is known
as astronomical unit
3
Meenu..
Look at
the sky
Really it is
wonder ful
!!!
Mom..
how
stars are
formed?

2. • Are all the stars seen in same colour?
…………………………………………………
• what are the coloures you have observed?
……………………………………….......
• Classify the stars on the basis of its colour
RED BLUE ORANGE
Thrikketa Regal Aldibaren
Thiruvathira ……………. ………………..
………………….. ……………… ………………….
• Which are the group of stars that you have identified?
…………………………………………………
Write in your science diary the name and form or shape of
the constellation you have identified.
Mom..are
All stars
same?

3. Gaseous clouds in the interstellar space itself is the birth place of stars
.these gaseous clouds are known as nebula.. In which contain hydrogen,
helium, and other molecules in a small amount. under the effect of
gravitational force gaseous clouds in the nebula concentrated into the
Centre. it is the first stage of birth of the stars. Due to the increasing of
gravitational force all the gases and particles continuously moves and
concentrated into the centre. Temperature for the fusion is produced
due to the gravitational force.
Which nebula will formed to stars easily. heavy mass nebula or light
mass nebula?
………………………………………………………………………
Big dipper
These are the some constellation

4. Solar systems
• Haven’t you seen certain objects among the stars which do not twinkle ?
…………………………………………………………….
• What are they?
………………………………………………………………
• Have you seen an object shining like a star in the west after sunset?
………………………………………………………………
The heavenly
body can be
seen in the
morning at
other times in
the east. This is
not a star. it is
the planet
Venus!
international astronomical
union – the planets are
heavenly bodies that
revolve around the sun in a
fixed orbit .
according to

5. solar system.
• How many planets are there in a solar system?
…………………………………………………………
• what are they?
…………………………………………………...........
• why did lose pluto’s position from the solar system?
……………………………………………………….
venus, mars& earth are
mainly composed of solid
substances like rock, iron and
nickel. They are called
terrestrial planets.
mercury,
Saturn, Uranus&
Neptune are mainly
composed of gases such as
hydrogen& methane .they
are called jovian planets.
jupiter

6. Besides planets and satellites there are other members too in the solar system
Asteroids
Between the orbits of mars & Jupiter a
group of celestial objects are revolve
around the sun, they are called asteroids,
we can see them only with the help of
telescope..
meteores
During some night we can see certain
objects in the sky burning down through
the atmosphere. They are meteors.
comets
Comets travels the farthest.t hey revolve
around the sun in an elliptical orbit. It
consist of condensed gases and rock
pieces.

7. Chandrayan project
chandrayan I is India's first ever
mission to explore the moon.it was
launched from the Sathish Dhawan space
centre in Sriharikotta on 22nd October 2008,
by the PSLV C-11 it started revolving round
the moon in a polar orbit of 100km height.
On 14th November it created history by
seperating the moon impact probe(MIP)
from the mother vehicle and landing it near
the south pole on the surface of the moon.
Chandrayan I aims to study this neighbour
of ours for the next two years by remote
sensing with the help of ten scientific
equipments.
The basic aim of this project is enhance to
our knowledge about the only natural
satellite of earth, the moon. Besides it also
proposes to increase India's technological
expertise in the field of technology and to
equip and enable the new generation Indian
scientists to face fresh challenges in
interplanetary researches.
MIP
PSLV 11

8. Significant learning outcomes
The learner can
• Explain the characteristics of different stars seen in the clear night sky
• Explain the formation of stars.
• Identify the stars by looking at its shape
• explain the solar systems and the celestial bodies other than the nine
planets.
• Explain the expedition to moon by India and other countries.
Let us assess
1) Describes the formation of stars ?
2) Draw and label the solar system and planets.
3) Now we have only 8 planet. Which planet lost its position as a
planet? why?
4) What is asteroids? Where it is found?
5) What are the characteristics of meteroids?
6) Briefly explain about comets?
7) Write a short note on expedition to moon by India

9. Extended activity
1. Make a model for solar system
2. List out various type of celestial bodies which are not mentioned in the
text book.
3. Find out more examples for stars which having different colours.
4. Explain the formation and the death of stars.
5. make short note on the missions promoted by India.
6. Make a chart of planets including the details of satellites in which have.