THE UNIVERSE..................

                                                                       THE UNIVERSE
The solar system consists of the Sun and 9 planets
revolving around it in different orbits. The statistics of
the sun and the planets are given below :
                   SUN
Age : About 5 Billion years
Distance : 149.8 Million Kms
Diameter : 1,38,400 Kms.
Photosphere temperature : 5,770 K
Core temperature : 150,000,000 K
Absolute visual magnitude : 4.75
Rotation (as seen from the
earth at the equator) : 25.38 days
Rotation (near the poles) : 33 days
The sun consists of 71% of Hydrogen, 26.5% Helium and
2.5% of other elements.
The rays of the Sun take about 8 minutes to reach the
earth.
PLANETS
(1) MERCURY : It is the planet nearest to
the earth.
Average distance
to the Sun : 57.6 Million Kms.
Diameter : 4,849.6 Kms.
Period of revolution : 88 days
Period of rotation : 58 days 15 hrs 30 mts. 34
sec.
(2) VENUS : It is also known as the
Morning Star or the
Evening Star. It is the
brightest of all the
planets.
Diameter : 12,032 Kms.
Period of revolution : 225 days
Period of rotation : 243 days 14mts.
(3) EARTH
Equatorial diameter : 12,756 Kms.
Polar diameter : 12,714 Kms.
Distance from the Sun : 149,597,900 Kms.
Period of revolution : 365 days 5 hrs, 48 mts,
45.51 sec.
Period of rotation : 23 hrs 56 mts. 4.09 sec.
LATEST STUDY MATERIALS WITH KEY POINTS
GENERAL KNOWLEDGE
(4) MARS
Diameter : 6,755.2 Kms.
Distance from the Sun : 225.6 Million Kms.
Period of revolution : 687 days
Period of rotation : 24 hrs 37 mts. 22.663 sec.
(5) JUPITER : This is the largest planet
in the solar system.
Diameter : 141,968 Kms.
Distance from the Sun : 772.8 Million Kms.
Period of revolution : 11.9 years
Period of rotation : 9 hrs 50 mts. 30 sec.
(6) SATURN : It was discovered by
Galileo.
Diameter : 119,296 Kms.
Distance from the Sun : 1,417.6 Million Kms.
Period of revolution : 29.5 years
Period of rotation : 10 hrs 14 mts.
(7) URANUS
Diameter : 52,096 Kms.
Distance from the Sun : 2,852.8 Million Kms.
Period of revolution : 84 years
Period of rotation : 16 hrs 10 mts.
(8) NEPTUNE
Diameter : 49,000 Kms.
Distance from the Sun : 4,497 Million Kms.
Period of revolution : 165 years
Period of rotation : 18 hrs 26 mts.
(9) PLUTO : This is the coldest and
smallest of all planets. It
is also the most distant
one.
Diameter : 3,040 Kms.
Distance from the Sun : 5,865.6 Million Kms.
Period of revolution : 248 years
Period of rotation : 6 days 9 hrs and 18 mts.
MOON : Moon is earth's satellite.
Its period of rotation and
Period of Revolution are
the same. i.e.29.5days.
                                                    THE EARTH DATA
Surface Area : 510,100,500 Sq.Kms.
Land Surface : 148,950,800 Sq.Kms.
(29.08%)
Water Surface : 361,149,700 Sq.Kms.
(70.92%)
Equatorial circumference : 40,075 Kms.
Polar circumference : 40,008 Kms
Equatorial radius : 6,377 Kms.
Equatorial Diameter : 1,22,756 Kms.
Polar radius : 6,357 Kms.
Polar Diameter : 12,714 Kms.
Mean distance from the
Sun : 14,95,97,900 Kms.
Period of revolution : 365 days 5 hours 48 mts.
45.51 Sec.
Period of rotation : 23 hrs. 56 mts. 4.091 Sec.
Escape Velocity from
the earth : 11 Km per Sec. (minimum)