2. Solar system
The Sun, its planets and all the objects moving around
them collectively are called Solar System.
The Solar System was formed approximately 4.6
billion years ago and consists of the Sun, planets, dwarf
planets and other astronomical objects bound in its orbit.
The Solar System is entirely dependent on Sun & the
only one which is self- luminous i.e. which has its own
light.
3. It is the source of all energy for
life on Earth.
About three quarters of the Sun's
mass consists of hydrogen, while
the rest is mostly helium.
It ‘s the heaviest among solar
system.
It is a ball of hot ,burning gases.
4. The word ‘Planet’ means wandering star.
Planets are heavenly bodies ,which revolve around the Sun in elliptical orbits.
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
5. According to the IAU, there are eight planets in
the Solar System. In increasing distance from the Sun,
the planets are:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
6. It is the closest planet to the Sun.
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 orbits the Sun once in about 88
Earth days.
7. Venus is surrounded by thick cloud
cover ,that is why it is called “Veiled
Planet”.
It is brightest & hottest planet.
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
8. 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 effect ion, so it
is also called Blue Planet..
Only planet having life .
It orbits the Sun once in about 365
Earth days.
Moon is the only satellite of the Earth.
9. It is often described as the "Red
Planet", as the iron oxide prevalent
on its surface gives it a reddish
appearance.
Mars has approximately half
the diameter of Earth
It has two satellites.
The gravity of Mars is half of the
earth.
10. Jupiter is the largest
planet within the Solar System.
It has a great Red Spot ,it is rotating
storm system inside the planet.
Jupiter rotates faster than any other
planet.
It completes one rotation in 10 hours.
Jupiter has a faint ring system, these
rings appear to be made of dust.
11. Saturn is the sixth planet from
the Sun and the second largest
planet in the Solar System,
after Jupiter.
Saturn rings are made up of ice
& ice covered particles.
It has 22 known satellites .
Saturn is 95 times heavier than
earth.
SATURN
12. The only planet which rotates on
its axis from east to west.
It has at least ten thin uniform
black rings ,which are made of dust.
It has 27 known satellites.
It is a very cold planet ,it receives
370 times less sunlight than Earth as
it is far away from sun as compared
to Earth.
Its core is very rocky.
13. Most distant gas planet.
Most windy planet
It has 8 known satellite
As it is very far from Sun, it
completes an orbit on average every
164.79 years.
The average distance between
Neptune and the Sun is 4.50 billion
km.
