3. What is Solar System?
Our Solar System is made up of nine
planets, their moons, and our sun. The
planets and their moons revolve
around, or orbit the sun.
The orbits are not round. They are
elliptical ( E-lip-tih-cul). Elliptical means
egg-shaped.

4. The first four planets are called the inner
planets. They are closest to the sun. Their
names are Mercury, Venus, Earth and
Mars. These planets are made mostly of
rock.
The next five planets are called
the outer planets. Saturn,
Jupiter, Uranus and Neptune are
called gas giants because they
are made mostly of gases. The
last planet is called Pluto. It is
coated with ice.

5. PLANETS OF THE SOLAR SYSTEM

6. MERCURY
-Mercury is the innermost and smallest planet in
the Solar System.[a] It orbits the Sun once every
87.969 Earth days, completing three rotations
about its axis for every two orbits. Mercury's orbit
has the highest eccentricity of all the Solar System
planets, and Mercury has the smallest axial tilt
VENUS
-Venus is the second planet from the Sun, orbiting it
every 224.7 Earth days.[10] The planet is named after
Venus, the Roman goddess of love and beauty. After
the Moon, it is the brightest natural object in the night
sky, reaching an apparent magnitude of −4.6, bright
enough to cast shadows.

7. EARTH
-Earth (or the Earth) is the third planet from the Sun, and
the densest and fifth-largest of the eight planets in the
Solar System. It is also the largest of the Solar System's
four terrestrial planets. It is sometimes referred to as the
world, the Blue Planet,[20] or by its Latin name, Terra.[note 6]
MARS
-Mars is named after the ancient Roman god of war, as
befitting the red planet's bloody color. The Romans
copied the ancient Greeks, who named the fourth
planet from the sun after their god of war, Ares. Other
civilizations also typically gave the planet names based
on its color

8. SATURN
-Saturn is the sixth planet from the Sun and the second
largest planet in the Solar System, after Jupiter. Named after
the Roman god Saturn, its astronomical symbol (♄)
represents the god's sickle. Saturn is a gas giant with an
average radius about nine times that of Earth.[
-
Saturn has a ring system that consists of nine continuous
main rings and three discontinuous arcs, composed mostly of
ice particles with a smaller amount of rocky debris and dust
JUPITER
-Jupiter, the most massive planet in our solar
system -- with dozens of moons and an
enormous magnetic field -- forms a kind of
miniature solar system. Jupiter does resemble
a star in composition, but it did not grow big
enough to ignite. The planet's swirling cloud
stripes are punctuated by massive storms
such as the Great Red Spot, which has raged
for hundreds of years.

9. URANUS
-Uranus is the seventh planet from the Sun and is the third largest
in the solar system. It was discovered by William Herschel in 1781.
It has an equatorial diameter of 51,800 kilometers (32,190 miles)
and orbits the Sun once every 84.01 Earth years. It has a mean
distance from the Sun of 2.87 billion kilometers (1.78 billion
miles). It rotates about its axis once every 17 hours 14 minutes.
Uranus has at least 22 moons. The two largest moons, Titania and
Oberon, were discovered by William Herschel in 1787.
NEPTUNE
-Neptune is the outermost planet of the gas giants. It has an
equatorial diameter of 49,500 kilometers (30,760 miles). If
Neptune were hollow, it could contain nearly 60 Earths.
Neptune orbits the Sun every 165 years. It has eight moons,
six of which were found by Voyager. A day on Neptune is 16
hours and 6.7 minutes. Neptune was discovered on
September 23, 1846 by Johann Gottfried Galle, of the Berlin
Observatory, and Louis d'Arrest, an astronomy student,
through mathematical predictions made by Urbain Jean
Joseph Le Verrier.

10. PLUTO
-Pluto is a dwarf planet (or plutoid) that usually orbits past
the orbit of Neptune. It was classified as a dwarf planet in
2006; before that it was considered to be a planet, the
smallest planet in our solar system. There are many other
dwarf planets in our Solar System. Pluto is smaller than a lot
of the other planets' moons, including our moon. Pluto has
not been visited by spacecraft yet; we only have blurry
pictures of its surface; even the Hubble Space Telescope
orbiting the Earth can only get grainy photos because Pluto
is so far from us. In 2015, a spacecraft called New Horizons
(launched by NASA in 2006) will visit Pluto.
Pluto is about 1,413 miles (2274 km) in diameter.
This is about 1/5 the diameter of the Earth.
Pluto is smaller than the 8 planets in our Solar
System.

11. Distance Radius Mass Rotation # Moons Orbital Orbital Obliquity Density
(AU) (Earth's) (Earth's) (Earth's) Inclination Eccentricity (g/cm3)
332,80
Sun 0 109 25-36* 9 --- --- --- 1.410
0
Mercury 0.39 0.38 0.05 58.8 0 7 0.2056 0.1° 5.43
Venus 0.72 0.95 0.89 244 0 3.394 0.0068 177.4° 5.25
Earth 1.0 1.00 1.00 1.00 1 0.000 0.0167 23.45° 5.52
Mars 1.5 0.53 0.11 1.029 2 1.850 0.0934 25.19° 3.95
Jupiter 5.2 11 318 0.411 16 1.308 0.0483 3.12° 1.33
Saturn 9.5 9 95 0.428 18 2.488 0.0560 26.73° 0.69
Uranus 19.2 4 17 0.748 15 0.774 0.0461 97.86° 1.29
Neptune 30.1 4 17 0.802 8 1.774 0.0097 29.56° 1.64
Pluto 39.5 0.18 0.002 0.267 1 17.15 0.2482 119.6° 2.03