Download The Solar System

What is a solar system?
 The Solar System consists of the Sun and its planetary system of eight
planets.
 The Solar System is located within one of the outer arms of Milky Way
 which contains about 200 billion stars.
 For many thousands of years, humanity, with a few notable exceptions,
 did not recognize the existence of the Solar System.
 People believed the Earth to be stationary at the centre of the
universe
 and categorically different from the divine or ethereal objects
 that moved through the sky.
 The Solar System formed 4.568 billion years ago from the gravitational
collapse of a region within a large
 molecular cloud.
Planets in the solar system.
1.
2.
3.
4.
5.
6.
7.
8.
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Mercury
• Although it is uncertain when Mercury was
discovered, its existence has been known since
antiquity due to its visibility to the naked eye.
Moreover, it is because the ancient Romans
had knowledge of Mercury that it received its
name. The explanation is simple. Since
Mercury orbits the Sun faster than any other
planet in the solar system, it appears and
disappears more quickly than other objects in
the sky.
Venus
• As the third brightest object in Earth's sky after
the Sun and moon, Venus has undoubtedly
been visible throughout all of human history.
However, prehistoric peoples' understanding of
the planet was inaccurate, for they believed
Venus to be two distinct objects, a morning and
an evening star. This misunderstanding was due
to Venus' visibility occurring just before dawn
and right after dusk, but not during the day.
Earth
• Earth is the third planet from the Sun and
largest of the terrestrial planets. Suprisingly,
while it is only the fifth largest planet in terms
of size and mass, it is the densest (5,513 kg/m3)
of all the planets. Regarding its name, Earth is
the only planet not named after a
mythological being. Instead, its name is
derived from the Old English word "ertha,"
which means ground.
Mars
• Mars is the fourth planet from the Sun and last
of the terrestrial planets. Like the rest of the
planets in the solar system (except Earth), Mars
is named after a mythological figure—the
Roman god of war. In addition to its official
name, Mars is sometimes referred to as the Red
Planet due to the color of its brownish-red
surface. Mars is the second smallest planet in
the solar system behind Mercury.
Saturn
• Saturn is the sixth planet from the Sun and
second largest planet of the Solar System in
terms of diameter and mass. If compared, it is
easy to see why Saturn and Jupiter have been
designated as relatives. From atmospheric
composition to rotation, these two planets are
extremely similar.
Jupiter
• Jupiter is easily the largest and most
massive planet in the Solar System. To put
this in perspective, it would take 11 Earths
lined up next to each other to stretch from
one side of Jupiter to the other and it
would take 317 Earths to equal the mass
of Jupiter!
Uranus
• Uranus, is the seventh planet in the Solar
System and third of the gas giants. It is the
third largest planet by diameter, yet fourth
most massive.
Neptune
• Neptune is the eighth planet from the Sun
and last of the known planets. While it is the
third largest planet with respect to mass, it is
only the fourth largest in terms of diameter.
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