Our Solar System

OUR SOLAR SYSTEM

The solar system refers to the collection of massive bodies that revolve around the sun. it consists of a star i.e., the sun, and other massive bodies that travel around it like planets, asteroids, comets, etc. It is believed that the nebula from which our solar system is formed, started collapsing and forming a core sometime between 5-5.6 billion years from the present, and planets are formed 4.6 billion years ago. The solar system consists of eight planets that are classified as inner and outer planets based on the asteroid belt. The planets near to sun are Mercury, Venus, Earth, and Mars. All these planets are largely made up of iron and rock. These planets are also known as Terrestrial Planets. The outer planets are Jupiter, Saturn, Uranus, and Neptune, largely composed of hydrogen, helium, ammonia, and methane. These planets are known as Jovian or Giant planets.

ASTEROIDS- these objects are made up of rock and are much smaller than planets although asteroids revolve around the sun like planets. These asteroids are found between the orbits of Mars and Jupiter.

 

 

THE PLANETS

MEAN DISTANCE FROM THE SUN (MILLION KM)

PERIOD OF REVOLUTION [DAYS (D), YEARS (Y)]

PERIOD OF ROTATION

[DAYS (D), HOURS (H), MINUTES(M), SECONDS (S)]

DENSITY IN gm/cm3

SATELLITES

INNER PLANETS

MERCURY

59.9

88 D

58.646 D

5.44

0

VENUS

108.2

224.7 D

+243 D

5.245

0

EARTH

149.6

365.26 D

23H56M4S

5.517

1

MARS

227.9

687 D

24H37M6S

3.945

2

THE ASTEROIDS

OUTER PLANETS

JUPITER

778.3

11.86 Y

9H50M30S

1.33

about 53

SATURN

1427

29.46 Y

40H14M

0.70

about 53

URANUS

2869.6

84.01 Y

10H45M

1.17

27

NEPTUNE

4496.6

164.8 Y

15H48M

1.66

13