introduction

universe has many galaxy

ptolemy told earth is centre of universe

COPERNICUS TOLD SUN IS CENTRE OF UNIVERSE....AND HE IS THE ONE WHO FOUNDED SOLAR FAMILY.....HE TOLD THAT 9 NINE PLANETS ROTATE ATOUND THE SUN.

KEPLER TOLD THAT SUN IS NOT THE CENTRE OF UNIVERSE BUT CENTRE OF SOLAR SYSTEM

THERE ARE MANY GALAXIES IN UNIVERSE TOLD BY HERSCHEL

milky way galaxy (SPIRAL GALAXY) is also called as  AKASH GALAXY

UNIVERSE FORMED BY BIG BANG THEORY 15 BILLION YEARS AGO




SUN

SUN IS A STAR. SUN IS 109 TIMES BIGGER THAN EARTH

SUN INTERIOR----PHOTOSPEHRE, CROMOSPHERE,CORONA
THE TEMP OF SUN IN ITS INTERIOR IS 15 DEGREE CELCIUS

PHOTOSHPERE TEMP IS 5760 K

SUN LIFE TIME IS 10 BILLION YEARS AND NOW THE AGE OF THE SUN IS 5 BILLION YEAR

THE BLACK LINES IN SUN ARE CALLED AS Fraunhofer lines.

THE BLACK DOTS SEEN IN THE SUN IS CALLED SUN DOTS.( THE TEMP IN DOTS IS LESSER THAN THE SUN)

STUDY OF SUN HELIOLOGY

SUN HAS HYDROGEN AND HELIUM

THE ENERGY FOR SUN IS BY NUCLEAR FUSION

SUNS RAYS TO REACH EARTH TAKES 8 MTS AND 16.6 SECONDS

TO ROTATE AROUND THE THE GALAXY SUN TAKES 25 CRORE YEARS (ITS CALLED ONE COSMIC YEAR)