Download The solar system

The Solar System
I.C. Giovanni Cena
Cerveteri
Italy
WHAT IS SOLAR SYSTEM ?
• The Solar System is the Sun and all of the
objects in space that orbit (go around) it.
The Sun is orbited by planets, moons,
asteroids, comets and other things.
ABOUT THE SOLAR SYSTEM
• There are eight planets in the Solar System. In
order of increasing distance from the Sun,
they are:
Mercury, Venus, Earth, Mars, Jupiter, Saturn,
Uranus and Neptune.
ABOUT THE SOLAR SYSTEM
• The first four planets are called terrestrial
planets. They are mostly made of rock and
metal, and they are mostly solid.
• The last four planets are called gas giants.
This is because they are large planets that are
mostly made of gas. They also have much
more mass than the terrestrial planets.
THE SUN
• The Sun is a star. It contains 99.9 percent of
the Solar System's mass. This means that it
has strong gravity. The other objects are
pulled into orbit around the Sun.
TERRESTRIAL PLANETS
MERCURY
Mercury is the smallest
planet in the Solar System.
It is the closest planet to
the sun. It makes one trip
around the Sun once every
88 days.
VENUS
• Venus is the second
planet from the Sun. It is
a terrestrial planet
because it has a solid,
rocky surface.
EARTH
The Earth is the third
planet from the Sun. The
Earth is also called the
Blue Planet. The Earth is
home to millions of species
of plants and animals,
including humans. Earth is
the only place in the
universe where life has
been confirmed to exist.
MARS
Mars is the fourth planet
from the Sun in the Solar
System. Mars is dry, rocky
and cold. It is home to the
largest volcano in the Solar
System. Mars is named
after the mythological
Roman god of war because
it is a red planet, which
signifies the colour of
blood.
GAS GIANTS
JUPITER
Jupiter is the largest planet
in the Solar System. It is
the fifth planet from the
Sun. Jupiter is classified as
a gas giant, because it is so
large, and is made up
mostly of gas.
SATURN
Saturn is the sixth planet
from the Sun in the Solar
System. It is the second
largest planet in the Solar
System, after Jupiter.
URANUS
Uranus is the seventh
planet from the Sun in the
Solar System. It is the third
largest planet in the solar
system. The planet is made
of ice, gases and liquid
metal.
NEPTUNE
Neptune is the eighth and last
planet from the Sun in the
Solar System. It is the fourth
largest planet and third
heaviest. Neptune has four
rings which are hard to see
from the Earth. It is 17 times
heavier than Earth and is a little
bit heavier than Uranus. It was
named after the Roman God of
the Sea.
PLUTO
Pluto is a Dwarf Planet.
What is a Dwarf Planet?
• Celestial body orbiting the Sun
• Massive enough to be rounded
by its own gravity
• BUT has NOT cleared its
neighboring region of
planetesimals
• Is not a satellite
Unusual orbit caused it to be the
8th planet from 1979 - 1999!
Let’s compare the
planets to Earth
A day on
Mercury
Venus
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
=
=
=
=
=
=
=
=
3 Earth months
117 Earth days
41 minutes longer than an Earth day
10 Earth hours
10 ½ Earth hours
13 ½ Earth hours
18 Earth hours
7 Earth days
If you weigh 85 lbs. on Earth, you we
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32 lbs on Mercury
77 lbs on Venus
32 lbs on Mars
244 lbs on Jupiter
112 lbs on Saturn
79 lbs on Uranus
105 lbs on Neptune
2.5 lbs on Pluto
The Orbital Speed of the Planets
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•
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
=
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30 miles per second
22 miles per second
19 miles per second
15 miles per second
8 miles per second
6 miles per second
4.2 miles per second
3.3 miles per second
2.9 miles per second
Therefore, the further away from the Sun, the slower the orbital
speed.
The Earth has one Moon.
How many moons do the other planets have?
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Mercury
Venus
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
-
0
0
2
17
22
15
2
1
It takes 365 days for Earth to revolve around the S
How long does it take the other planets?
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Mercury
Venus
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
-
88 Earth days
225 Earth days
about 2 Earth years
11.8 Earth years
30 Earth years
84 Earth years
165 Earth years
248 Earth years
.