The document discusses the key characteristics of planets in our solar system. It describes how planets are classified into inner and outer planets, with Mercury, Venus, Earth and Mars as the inner planets and Jupiter, Saturn, Uranus and Neptune as the outer planets. An asteroid belt exists between the inner and outer planets. Details are then provided about the inner planets Mercury, Venus and Earth, describing their sizes, distances from the Sun, compositions and other notable features.

1. Planets

2. Planets
• Planet word comes from Greek ,which means wandering star.
• Planets are heavenly bodies ,which revolve around the Sun in
elliptical orbits.
• Earlier it was considered there were 9 planets in Solar system
but lately one planet called Pluto was de-classified from being
a planet.
• All planets fall in 2 groups
Inner Planets : Mercury , Venus, Mars and Earth are called
inner planets.
Outer Planets : These are Jupiter , Saturn, Uranus, Neptune

3. • Between Inner & Outer Planets ,there is a ring
of small bodies , which are made of rock &
metal, these are called Asteroids. They also
keep moving around the Sun .This ring is also
called Asteroids Belt.

4. Mercury
The smallest planet in
the solar system.
The planet nearest to
the Sun.

5. Mercury –The Innermost Planet
• It is named after
messenger of the
Roman gods
• It is the closest planet
to the Sun
• Large variations in day
(400 degree C) & night (-
180 degree C) time
temperatures.

6. • It is also the smallest, and its orbit is the
most not fully circular.
• It does not have any satellite.
• There is no water or atmosphere
• It can be seen with naked eyes.
• It orbits the Sun once in about 88 Earth days
• There are no seasons on its surface
Mercury –The Innermost Planet

7. Venus
The fourth smallest
planet in the solar
system.
 The second planet from
the Sun.
And it is seen from
Earth as a bright
morning or evening star.

8. • Venus is surrounded
by thick cloud cover
,that is why it is called
“Veiled Planet”.
• It is brightest &
hottest planet.
• It is named after
Roman goddess of
love & beauty .

9. • It orbits the Sun once in about 225 Earth days.
• Venus reaches its maximum brightness shortly
before sunrise or shortly after sunset, so it is
also known as the Morning Star or Evening
Star.
• Venus is also known as “Sister “ or “Twin”
planet to earth because of its similar size &
mass to earth.
Venus –The Veiled Planet

10. Earth
 The third planet in order from the
Sun with an orbital period of
365.26 days.
 Has a distance from the Sun of
93,000,000 mi.
 Surrounded by an atmosphere
composed primarily of nitrogen
and oxygen.
 And it is the only planet in the
universe known to support life.

11. Earth –The Blue Planet
• It is also known as
watery planet, because
70% of its surface is
covered by water.
• It reflects about 1/3rd of
sunlight it receives .The
earth’s atmosphere
scatters the light &
creates a blue effectn,so
it is also called Blue
Planet..
• Only planet having life .

12. • It orbits the Sun once in about 365 Earth days.
• It rotates about its own axis, thus creating day &
night. It takes 24 hours to do that.
• It revolves around sun, due to its tilt ,seasons are
created.
• Due to gravity, the layer of gases remain attached
to it (which is known as atmosphere), it prevents
too much heat or UV rays from Sun reaching
earth.
• Moon is the only satellite of the Earth.
Earth –The Blue Planet

13. Mars –The Red Planet
• It is named after
the Roman god of war.
• It is often described as
the "Red Planet", as
the iron oxide prevalent
on its surface gives it
a reddish appearance

14. • Mars has approximately half the diameter of Earth
• It has two satellites.
• The gravity of Mars is half of the earth .
• The atmosphere of Mars consists of about
95% carbon dioxide, 3% nitrogen,1.6% argon
and contains some oxygen and water
• Mars also has the largest dust storms in the Solar
System