RRB NTPC EXAM - 2016 :: Detailed About Planets For Railway And SSC Exams.

RRB NTPC EXAM - 2016 :: Detailed About Planets For Railway And SSC Exams.
RRB NTPC EXAM - 2016 :: Detailed About Planets For Railway And SSC Exams.

MERCURY

The closest planet to the sun, Mercury is only a bit larger than Earth's moon. Its day side is scorched by the sun and can reach 840 degrees Fahrenheit (450 Celsius), but on the night side, temperatures drop to hundreds of degrees below freezing. Mercury has virtually no atmosphere to absorb meteor impacts, so its surface is pockmarked with craters, just like the moon.

Planetary Order:                           1st planet from the sun
Planet Size:                                      4,880 Kilometers
Rotation Time (Earth Days):   59
Orbit Time (Earth Years):        241
Orbit Time (Earth Days):         88
Distance from the Sun =          4 AU’s
Kilometers:                                   60 million
Planet named for:                      Roman god of speed


VENUS

Venus is terribly hot, even hotter than Mercury. The atmosphere is toxic. The pressure at the surface would crush and kill you. Scientists describe Venus’ situation as a runaway greenhouse effect. Its size and structure are similar to Earth, Venus' thick, toxic atmosphere traps heat in a runaway "greenhouse effect." Oddly, Venus spins slowly in the opposite direction of most planets.The Greeks believed Venus was two different objects — one in the morning sky and another in the evening. Because it is often brighter than any other object in the sky — except for the sun and moon — Venus has generated many UFO reports.

Planetary Order:                                  2nd planet from the sun
Planet Size:                                             12,103 Kilometers
Rotation Time (Earth Days):             243
Orbit Time (Earth Years): .                615
Orbit Time (Earth Days):                   225
Distance from the Sun =                   7 AU’s
Kilometers:                                            108 million
Planet named for:                               Roman goddess of love and beauty

EARTH

Earth is a water world, with two-thirds of the planet covered by ocean. It’s the only world known to harbor life. Earth’s atmosphere is rich in life-sustaining nitrogen and oxygen. Earth's surface rotates about its axis at 1,532 feet per second (467 meters per second) — slightly more than 1,000 mph (1,600 kph) — at the equator. The planet zips around the sun at more than 18 miles per second (29 km per second).

Planetary Order:                                         3rd planet from the sun
Planet Size:                                                    12,756 Kilometers
Rotation Time (Earth Days):                  1
Orbit Time (Earth Years):                        1
Orbit Time (Earth Days):                         365
Distance from the Sun =                            1AU
Kilometers:                                                     150 million
Number  of Moons: 1 Major Moons:       Moon
Planet named for:               The Earth has hundreds of different names in different languages
Mean Temperature:   150°C/20°C

MARS

is a cold, dusty place. The dust, an iron oxide, gives the planet its reddish cast. Mars shares similarities with Earth: It is rocky, has mountains and valleys, and storm systems ranging from localized tornado-like dust devils to planet-engulfing dust storms. It snows on Mars. And Mars harbors water ice. Scientists think it was once wet and warm, though today it’s cold and desert-like.Mars' atmosphere is too thin for liquid water to exist on the surface for any length of time. Scientists think ancient Mars would have had the conditions to support life, and there is hope that signs of past life — possibly even present biology — may exist on the Red Planet.

Planetary Order:                                        4th planet from the sun
Planet Size:                                                    6794 Kilometers
Rotation Time (Earth Days):                 1.02
Orbit Time (Earth Years):                       1.88
Orbit Time (Earth Days):                         686
Distance from the Sun  =                         AU’s:  1.5         
Kilometers:                                                    228
Number  of Moons: 2 Major Moons: Phobos and Deimos
Planet named for: Roman god of war

JUPITER

Jupiter is huge and is the most massive planet in our solar system. It’s a mostly gaseous world, mostly hydrogen and helium. Its swirling clouds are colorful due to different types of trace gases. A big feature is the Great Red Spot, a giant storm which has raged for hundreds of years. Jupiter has a strong magnetic field, and with dozens of moons, it looks a bit like a miniature solar system.

Planetary Order:                                     5th planet from the sun
Planet Size:                                               142,984 Kilometers
Rotation Time (Earth Days):            41
Orbit Time (Earth Years):                 12
Orbit Time (Earth Days):                 4,330
Distance from the Sun =                   AU’s:  5.2
Kilometers:                                           778 million
Number  of Moons: 63              Major Moons: Callisto, Europa, Io and Ganymede
(Ganymede is the largest moon in our solar system)
Planet named for:                      The King of Roman gods

RRB NTPC EXAM - 2016 :: Detailed About Planets For Railway And SSC Exams.
RRB NTPC EXAM - 2016 :: Detailed About Planets For Railway And SSC Exams.

SATURN

When Galileo Galilei first studied Saturn in the early 1600s, he thought it was an object with three parts. Not knowing he was seeing a planet with rings, the stumped astronomer entered a small drawing — a symbol with one large circle and two smaller ones — in his notebook, as a noun in a sentence describing his discovery. More than 40 years later, Christiaan Huygens proposed that they were rings. The rings are made of ice and rock.

Planetary Order:                          6th planet from the sun
Planet Size:                                    120,536 Kilometers
Rotation Time (Earth Days):    44
Orbit Time (Earth Years):          29.46
Orbit Time (Earth Days):            10,748
Distance from the Sun = AU’s:    9.5
Kilometers:                                              1,426,725,400
Number  of Moons: 52              Major Moons: Titan, Rhea, Iapetus, Phoebe
(Titan is the 2nd largest moon in our solar system)
Planet named for:                     Roman god of agriculture

URANUS

Uranus is an oddball. It’s the only giant planet whose equator is nearly at right angles to its orbit — it basically orbits on its side. Astronomers think the planet collided with some other planet-size object long ago, causing the tilt. The tilt causes extreme seasons that last 20-plus years, and the sun beats down on one pole or the other for 84 Earth-years. Uranus is about the same size as Neptune. Methane in the atmosphere gives Uranus its blue-green tint. It has numerous moons and faint rings.

Discovery:                        1781 by William Herschel (was thought previously to be a star)
Planetary Order:            7 th planet from the sun
Planet Size:                      57,118 Kilometers
Rotation Time (Earth Days):       72
Orbit Time (Earth Years):             83.75
Orbit Time (Earth Days):           30,685
Distance from the Sun = AU’s:      19.2           
Kilometers:                                        2.4 billion
Number  of Moons: 27              Major Moons: Oberon & Titania were discovered first,
then Ariel and Umbriel.
Planet named for:             A Roman god who was father of the Titans

NEPTUNE

Neptune is known for strong winds — sometimes faster than the speed of sound. Neptune is far out and cold. The planet is more than 30 times as far from the sun as Earth. It has a rocky core. Neptune was the first planet to be predicted to exist by using math, before it was detected. Irregularities in the orbit of Uranus led French astronomer Alexis Bouvard to suggest some other might be exerting a gravitational tug. German astronomer Johann Galle used calculations to help find Neptune in a telescope. Neptune is about 17 times as massive as Earth.

Planetary Order:               8th planet from the sun
Planet Size:                         49,532 Kilometers
Rotation Time (Earth Days):       67
Orbit Time (Earth Years):             163.72
Orbit Time (Earth Days):              60,189
Distance from the Sun =            AU’s:  30.1    
Kilometers:                                     4.5 billion
Number  of Moons: 13              Major Moons: Triton
(which rotates in the opposite direction of the planet)
Planet named for:           The Roman god of the sea

PLUTO (Dwarf Planet)
Once the ninth planet from the sun, Pluto is unlike other planets in many respects. It is smaller than Earth's moon. Its orbit carries it inside the orbit of Neptune and then way out beyond that orbit. From 1979 until early 1999, Pluto had actually been the eighth planet from the sun. Then, on Feb. 11, 1999, it crossed Neptune's path and once again became the solar system's most distant planet — until it was demoted to dwarf planet status. Pluto will stay beyond Neptune for 228 years.

Discovery:                 1930 by Clyde Tombaugh
Planetary Order:    9th planet from the sun
Planet Size:               2,274 Kilometers
Rotation Time (Earth Days): 6.39
Orbit Time (Earth Years): 248
Orbit Time (Earth Days): 90,465
Distance from the Sun  = AU’s:  39.5              
Kilometers:                        5,906,380,000
Number  of Moons: 3 Major Moons: Charon, Hydra, Nix
Planet named for: Roman god of the underworld


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