The document discusses astronomy as the study of celestial objects and phenomena beyond Earth's atmosphere, including the sun, moon, planets, stars, and galaxies. It describes various characteristics of solar system bodies, such as size, composition, and orbits, along with notable features like nuclear fusion in the sun and the life cycle of stars. Additionally, it covers the classification of galaxies and constellations, illustrating the vastness and complexity of the universe.

2. • Introduction.
• Astronomy.
• Types.
• Sun,Moon, Planets,Stars
& Galaxy
We have to see.....

3. • Humans are always curious about
Nature.
• Little tiny light spot.
• He also noticed the Unique phenomenon
Which are Supportive and also some
are Destructive.
• After they started to name things.
like Star , Planet ,..etc
Introduction

4. • Earth is Flat.

5. • Depending on the diffrent stars the
Weather changes .
• How day and night happens,
• How eclipse happens.
• All these observations and study leads
to Development of new Branch called
Astronomy.

6. Astronomy
• Astronomy is the study of everything in the Univers
beyond earths atmosphere.That include object we can see
with our naked eyes. Like Sun ,Moon, Planets and stars.
Two types
1. Observational Astronomy: Which is the method of studing
univers by using Telescope & camera.

7. 2. Theoritical Astronomy: Theorotical study of the
universe using the data which is obtained by the
Observational Astronomy
We shall see about some stellar object like
SUN , MOON, PLANETS,STARS & GALAXY.
Light-year is the distance light travels in one year.
Light zips through interstellar space at 186,000
miles (300,000 kilometers) per second and 5.88
trillion miles (9.46 trillion kilometers) per year

8. SUN
ball of Plasma.
• Nuclear fusion reaction.
• Sun is made One of the nearest star to us.
• made up of 73% of Hydrogen ,25% of Helium & 2%
other gases.
• Core fuses around 600 Million TONS of Hydrogen
into helium per sec.
• Energy takes 10000 years to escape from core to
the outer shell.

9. • The energy is mainly as visible light,UV
Radiation & Infrared radiation.
• The size of the sun is 106 times grater
than the size of Earth.
• 99.86% total mass of the Solar
system.(S.S)
• Distance b/w Sun & Earth is called as
Astronomical Unit.
• 150 million km = 1au

10. MOON
• Name?
• Natural satellite.
• 384400km distance from earth.0.002441au
• 5th Largest Natural satellite in our S.S.
• 27 Days to complete one round around its orbit.
• Age...?
• 4.53 Billion year old

11. • we can only see the one face of the Moon.
• Depending on the evoluvation Full moon day and
No moon day happens once in 15 days.
• it only reflects part of the Sun light.
• Moon looks bigger than the sun but actually moon
is samller, this is becuase of Distance between
them w.r.to earth.

12. Planets.
• 8 planets are in our solar system.
• Made up of ROCK, GAS & Ice.
• Based on this planets are divided Three
set.
• ROCKY: Mercury, Venus, Earth & Mars.
• GAS Gaints: Jupitar, Saturn.
• Ice Gaints: Uranus, Neptune.

13. • There is also Planets
beyond Neptune.
• They are called
Exoplanets.
• we shall see one by
one.

14. Mercury
• Smallest.
• Closest.(0.4Au)
• It does not have moon.1day =59day
• 88 days.3.7m/s2
Venus
Hottest planet.(4560c)
Green house effect.0.7au
224 days

15. Earth
• It is the only planet which support life.
• which contains 72% water and remaing portion
as land.
• Earth is the only planet which contains Ozone
layer.Gravity of earth is 9.8m/s2
• 365 days.

16. Mars
• Dusty,Cold Desert.
• Thin atmosphere.
• Contains water.
• 687 days.
Jupiter
Biggest.hard to see surface,1300 earth.
Great red spot.It have 79 moons.
4333 days.

17. Saturn
• Ring.2nd largest.
• Dust & Gas.
• 10,759 days.
• Uranus
• Coldest,Distance of 2.88 Billion km
• 900 Tilt
• Looks like Rolling.Blue dot.
• 30,687Days

18. • Distant Planet.
• cold & Dark.
• 17 times heaviour than earth.
• Supersonic wind are there.
• 60,190 days.
Neptune

20. • Star is a massive self luminous celestial
body of gas that shines by radiation derived
from its internal energy Source.
• They have life cycle.like we humans.
• That depends on amount of gas present in it.
• They made up of helium and Hydrogen.
Stars.

21. • Nebula.
• Nuclear fusion reaction.
• Hydrogen into Helium.
• 3000 stars we can see in our night sky.
• 1022 stars in our Galaxy.
• constellation
• A constellation is a group of stars that
appears to form a pattern or picture.

22. What are the 12 constellation of the
zodiac
One constellation tradition is the
western zodiac, which is made up of 12
constellations Aries, Taurus, Gemini,
Cancer, Leo, Virgo, Libra, Scorpius,
Sagittarius, Capricornus, Aquarius, and
Pisces

23. Galaxy
• Galaxy is a collection of all Stars, Planets,
Satellites.
• 2 Trillion galaxies in our Space.
• Each of them of Diffrent size.
4 type of Galaxies
1. Spiral.
2. Elliptical
3. peculiar
4. Irregular

24. • Milky Way
• Appears as Milk spread
in sky,
• 10X1017km .
• Milky way is Spiral in
shape.
• Radius of 52850 L.Y
• https://youtu.be/libKVRa01L8

25. Thankyou.