Stars and Galaxies in The Universe

Galaxy

Set of bodies consisting of millions of stars with gas and dust particles

Types of galaxies

Spiral, Elliptical and Irregular

The Milky Way

A medium large spiral galaxy

Stars

Stars are formed from nebulae

Nebulae

Large clouds consisting of dust particles and gases such as helium and hydrogen

Red giant

Expanded stars due to burning of hydrogen within outermost layer of the stars

Supernova

Red giants contracts so quickly that a big explosion occurs

Neutron star

As a result from supernova

Black hole

Supernova of a super-large star

The brightness of a star

Depends on its size, distance and surface temperature