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GENERAL KNOWLEDGE : GEOGRAPHY




SOLAR SYSTEM
Our solar system consists of a star (sun), 8 planets and countless fragments of left over called asterroids, meterors, comets and satelites of the planet
The sun
It is one of the star in the Milky way.
The sun is 109 time bigger on the earth and weighs 2x 10^7 tons.
Its glowing surface, which we see, is called Photosphere
The energy of sun comes from the fusion of hydrogen into helium.
Sunlight takes 8 minutes 16.6 seconds to reach earth.
The sun's present age is 5 billon years and the total life is10 billion years.

SUN :SOME FACTS

  • Average distance from Earth : 14,95, 98,900 km
  • Diameter : 13,91,980 km
  • Temperature at Core : 1,50,00,000 degree c.
  •  Temperature at photosphere : 5,760 degree C.
  • Rotation period : 25 days (at quater), 33 days (at poles)
  • Chemical Composition : Hydrogen -70%, Helium-28%, Others-2%
  • Age : 4.6 billon (approx)
  • Expected Life : 10 billion (approx)
  • Time taken by light to reach from sun to earth : 8 min.16.6 sec.
  • Velocity of Light : 3,00,000 km/s
  • Gravitational Pull : 28 time than that of Earth.


PLANETS

MERCURY:

  • Rotation : 58.65 days.
  • Revolution: 88 days ( Fastest revolution in Solar Ssytem)
  • Maximum diurnal range of temperature. Its day are scorching hot and nights are frigid.
  • It has no atmosphere and no satelites.

VENUS

  • Also called Earth's Twin, because it is slightly smaller than earth.
  • Populerly as known as Evening star and Morning star.It is seen in the east in the morning and in the west in evening.
  • Brightest object after sun and moon (because of 70% albedo, are reflecting power)
  • Closest planet of earth.
  • It is hottest planet in solar system.It is because of the Green house effect as its Atmosphere contains 90%-95% carbon dioxide.
  • Rotates backward ( clockwise) unlike others.
  • It has no satellite.
  • Slowest rotation in solar system (257 days)

MARS


  • Also called Red Planet.
  • Revolution : 687 days
  • Rotation: 24.6 hrs
  • It has a thin atmosphere comprising of nitrogen and argon.
  • It is marked with dormant volcanoes and deep chasms where once water flowed.
  • The highest mountain here is named 'Nix Olympia', which is 3 time higher than Mount Everest.
  • It has two satellite -Phobos and Deimos.


JUPITER

  • Fifth planet from the sun and largest of all planets.Called Lord of the Heavens.
  • Its gives off more energy than it receive from the sun, because of the hit inside.
  • Its atmosphere contains hydrogen, helium,methane and ammonia.
  • A great red spot is detected on it.It represents a huge storm.
  • It has the fastest rotation time(9.8 hour) in the solar system.
  • It has 63 satelites (prominent Europa, Gannymede & Callisto).Gannymede is the largest satellite of Solar system.

SATURN

  • Second in size after Jupiter.
  • Revolution : 29 years,
  • Rotation : 10.3 hrs
  • Least density of all (30 times less dense than Earth)
  • Unique feature is the system of rings( 3 well defined)
  • 31 satellite ( prominent is Titan)


URANUS

  • Rotates from north to south as it is inclined at an angel of 98 degree to its orbit.
  • Revolution : 84 years
  • Rotation : 10.8 hrs
  • Surrounded by a system of 9 faint rings
  • Has 21 satellites ( prominent are Miranda, Ariel etc)


NEPTUNE

  • Appears as ' Greenish Star'
  • Revolution : 165 years
  • Rotation: 15.7 days
  • Discovered by JG Galle of Berlin in 1846
  • It has 14 satellites. (prominent are Triton and Nereid)


PLUTO

  • Pluto is the sevond largest known Dwarf Planet in the Solar system.
  • Since its discovery by Clyde.


SOLAR SYSTEM :SOME FACTS

  • Bigest Planet : Jupiter
  • Smallest Planet : Mercury
  • Nearest planet to sun : Mercury
  • Farthest planet from sun : Neptune
  • Brightest Planet : Venus
  • Nearest planet to Earth : Venus
  • Brightest Star after sun : sirius
  • Planet with maximum satellite : Jupiter
  • Coldest Planet: Neptune
  • Hottest Planet : Venus
  • Heavest Planet : Jupiter
  • Red Planet : Mars
  • Biggest Satellite : Gannymede
  • Smallest Satellite : Deimos
  • Blue Planet : Earth
  • Morning/ Evening Star : Venus
  • Earth Twin : Venus
  • Green Planet : Neptune
  • Planet with a Big red spot : Jupiter
  • Lord of the Heavens : Jupiter
  • Greatest Diurnal Temperature : Mercury.

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