THE  SPACE

             Many scientists believed that universe is formed from big bang explotion

before 10-20 billion years ago.The age of the universe estimated about 13.7 billion years.The milky way galaxy is a spiral galaxy.Our sun and the solar system is a small part of it.Most of the stars are seen in the milky way galaxy.The planet such as ,

                               *Mercury

                               *Venus

                               *Earth

                               *Mars

                               *Jupiter

                               *Saturn

                               *Uranus

                               *Neptune and

                               *Pluto 

are seen in the solar system.

It also includes numerous satellites,meteors,meteoroids and asteroids.The moon is the natural satellite of the earth.The moon orbits around the earth and complete

one revolution in 27 days,7 hrs,43min,11.5 sec.The space station were built at space for scientific and engineering works and for repairing space crafts.

                I read this from the book "ULTIMATE ENCYCLOPEDIA OF SCIENCE".it is very interesting.

                                                THANK YOU