Planets are dark celestial bodies, does not have its own light, and always revolves around a true star that is the sun. In the order ac...
Planets are dark celestial bodies, does
not have its own light, and always revolves around a true star that is the sun.
In the order according to its distance from the sun, the planets are Mercury,
Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
There are three ways of grouping of
planets.
First,
the grouping of the planet with the asteroid's trajectory as a barrier, the
planets are grouped into two inner planets and outer planets. Mercury, Venus,
Earth, and Mars is also known as the planet, while Jupiter, Saturn, Uranus, and
Neptune are known as the outer planets.
The second grouping with the earth as a barrier,
there are two groups, namely the planet inferior and superior planets. Inferior
planets are planets that orbit lies within the Earth's orbit around the sun,
which includes a group of this planet is Mercury and Venus. Superior planets
are planets whose orbits lie outside the Earth's orbit around the sun, which
includes a group of this planet is Mars, Jupiter, Saturn, Uranus, and Neptune.
The third classification is based on the size and composition of the
constituent, namely the terrestrial planets (terrestrial planets) and a large
planet (major planets). Include terrestrial planets Mercury, Venus, Earth, and
Mars, while the major planets include Jupiter, Saturn, Uranus, and Neptune.
Each planet revolves around the sun in an elliptical giant, which looks like a
circle.
Important things of the planet is as
follows.
a. Planet does not have its own light, only reflects light from the sun.
b. The planets orbit around the sun in the same direction. The longer
circulation time if the distance from the sun even further.
c. The trajectory of the planets are fields oval (ellipse), and only
forming small angles (angle of inclination) to the plane of the ecliptic.
d. Most planets have satellites (accompanist) or months.
In more detail, an explanation of the
planet is as follows.
1) Mercury
Mercury is known in Arabic as Mercury,
and in Sanskrit is called Latitude Buddha. Mercury is the planet that is
located closest to the sun. Its average distance from the sun approximately 58
million km. Orbit around the sun within 88 days. This means that one year on
earth is equal to 365 days more than 4 years at Mercury. Its diameter is approximately
4,800 km, only about a third more be-sar of our moon. Its small size and
proximity to the sun caused Mercury's very difficult to see without the use of
tools, such as telescopes.
2) Venus
Planet Venus is known in Arabic with
Zuhara and in Sanskrit is called Sita. Venus is very bright star, which is
always visible in the western sky at sunset (evening star) and in the eastern
sky at sunrise (Morning Star).
The size and mass of Venus is similar to
Earth. Venus diameter size of about 1,100 km, whereas the diameter of the Earth
12 725 km. Its mass is less than 4/5 the mass of the Earth. Density is about
9/10 of the density of the planet Earth. Venus may rise 4 hours prior to
sunrise and sunset probably 4 hours after sunset.
3) Earth
Our Earth is a planet, a celestial bodies
like the sun, moon and stars b. According to the estimates of scientists, the
mass of the Earth is 5.96 × 10 27 g. Earth has a size of round figures, namely:
a) circumference at the equator of 40,000
km.
b) The radius at the equator 6378 km.
Earth has a size similar to Venus. Earth
experienced rotation for 24 hours and bring about a revolution over 365 1/4
days. Earth has an atmosphere and have a satellite such as the moon.
4) Mars
Mars is known in Arabic as Mars, while in
Sanskrit is called Anggoro. Be seen with the naked eye (without binoculars) or
with binoculars, Mars looks red. Mars by the ancient Greeks regarded as the god
of war, while the Javanese call latitude Joko Belek.
Mars much smaller than the Earth. The
average diameter of 6780 km, less than 1 2 the center line of earth. The volume
is only about one seventh of the volume of the Earth. Mars mass ratio of the
mass of the Earth is 11: 110. Comparative density Mars with the density of the
earth is 70: 100. The amount of light and heat received from the sun Mars on
every surface, is less than 1/2 received by the earth.
Chemically, the Martian atmosphere is
very different from the air of the earth. There were only a few layers of
oxygen, nitrogen, and water vapor in the atmosphere. Carbon dioxide is the main
gas in Mars. A large mass of hydrogen also surrounds the planet. It is
important that the most interesting and perplexing about the Martian atmosphere
is incredible cyclone dust that periodically swept across the planet.
5) Jupiter
Jupiter is known in Arabic as Mustari,
and in Sanskrit is called Wrespati. Jupiter is the largest planet in our solar
system, bigger than other stars. The volume is 1,300 times the volume of Earth.
Its diameter is 142 860 km. For comparison, the center line of earth is less
than 13,000 km, almost no Jupiter 1/11 midline. Jupiter can be seen easily
because of two main reasons, namely Jupiter has a very large size and the
planet is reflecting more than 70% of the sunlight that falls on the surface.
6) Saturn
Saturn in Arabic called Zahal, while in
Sanskrit is called Syanaiscara. Saturn is a planet that has the beauty of the
encircling ring system. The system includes not only the planet Saturn and the
rings, but including its 18 satellites.
The average distance of Saturn from the
sun 1.428 billion km, or about 9 1/2 times the distance of Earth from the sun.
Saturn complete its orbit once every 29 1/2 years.
7) Uranus
One night on March 13, 1781, Herschel
observed the stars in the constellation Gemini with a 18 cm reflector telescope
newly made. Suddenly he saw a star that is shaped like a disc and change its
position among the stars. Herschel concluded that the moving stars is a comet.
Furthermore, the astronomers observed the star carefully, and concluded that
the new celestial bodies is a planet, and Herschel mentions as inventor.
At first Herschel gave the name of the
new planet Georgium Sidus (George's Star). German astronomer Johann Elert Bode
proposed that other planets were named after ancient gods, the planet
eventually named Uranus.
The average distance of Uranus from the
Sun is 2.87 billion km and around the sun in one track for 84.01 years. Uranus
has a diameter of about 50,100 km at the equator and density approximately
one-quarter the density of the earth. Uranus rotates around its axis once every
24 hours.
8) Neptune
Neptune's average distance from the sun
is 4.5 billion km. Neptune takes about 165 years to complete its rotation around
the sun, the rotation period of 22 hours. The diameter of the planet around
48,600 km at its equator. Neptune density roughly half of the density of the
earth.
Like Uranus, Neptune shape of a disc,
greenish, which is not visible to the naked eye, but it is quite clear when
viewed through a telescope. Neptune's atmosphere consists of methane and
ammonia, the amount of methane that is a lot more. The maximum temperature on
the surface of Neptune about 190 ° C.
Neptune has eight satellites two of which
are already known, namely Triton and Nereid. Triton was first seen by British
astronomer William Lassel, a few weeks after the discovery of the planet
Neptune. Triton is slightly larger than the moon. Triton revolves around
Neptune from east to west. This is a backward motion, the opposite direction to
Neptune's rotation. Nereid per all times in 1949 by GP Kuiper. Nereid is much
smaller than Triton and is very far from Neptune, direct movement from west to
east.
Thus the material on this planet I say,
may be useful ...
