About Stars....

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the nuclear reactions inside the cores held by their own gravity. The nuclear reaction in its core support the star against gravity and produce photons and heat.

The most prominent stars are grouped into constellations and many of the brightest stars have proper names.

The star-forming region (taken by Hubble telescope)

FORMATION

A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. The total mass of a star is the main factor that determines its evolution and fate. For most of its active life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that transverses the star's interior and then radiates into outer space. At the end of a star's lifetime, its core becomes a compact star: a white dwarf, a neutron star or if it is sufficiently massive, a black hole.

TYPES OF STARS:

There are 7 types of stars classified on the basis of colour, brightness and size:

1. Protostars
2. T-Tauri Stars
3. Red Dwarf Stars
4. White Dwarf Stars
5. Supergiant Stars
6. Red Giant Stars
7. Neutron Stars 

                                                                                                                   

                                                                                                                                

                                                                                                                                     -By Kumar Amityush