Basic introduction to celestial bodies, mostly pictures from internet

3.  Sun is a star!
 Planets?
 Satellites for planets…
 Asteroids
 Comets

4.  Sun is a star!
› How big? 330,000 times that of Earth
› How hot? Few million Kelvin – 6000 K
 Planets? 8 planets!
 Satellites for planets… Except Mercury and Venus
 Asteroids
 Comets

5.  Nebulae
› Gaseous, largely hydrogen
› Nursery for stars
› Detected in HII or IR wavelengths
 Types of nebulae:
› Emission nebulae
› Reflection
› Dark nebulae
› Planetary nebulae

7.  Stars
› Balls of Hydrogen: some big, some small
› Big stars lives short and small one lives for
long
› End as white dwarfs, neutron stars, pulsars or
as black hole!
› Determines the age of clusters/galaxies

9.  Pulsars:
› Torch lights!
› Good time keepers
 Black holes:
› Tiny bit and not too much to worry
› Their existence is a necessity!

11.  Collection of stars
 Powered by black holes
 Special types: AGN(Active Galactic
Nuclie), Gamma ray bursts
 Types:
› Elliptical galaxies
› Spiral galaxies
› Barred spiral galaxies
› Irregular galaxies

16. Thank you for your patience