Supernovae are stellar explosions that occur when massive stars die. There are two main types of supernovae: Type Ia supernovae result from a white dwarf star absorbing material from a companion star, causing it to explode from exceeding critical density; Type II supernovae occur in very massive stars after nuclear fusion can no longer continue in their cores, causing gravitational collapse. Supernovae play an important role in enriching the interstellar medium with heavier elements and can trigger the formation of new stars by the expansion of shock waves.

1. Supernova R. Sri Madhavi

2. What is Supernova? Supernova is a celestial body Supernova is actually a stellar explosion The term, “Supernova” was coined in 1926 by a Swedish astrophysicist, Fritz Zwicky

3. What is the meaning of Supernova? A very bright new star shining in the celestial sphere

4. How often does a Supernova occur? About once in 50 years It happens in the galaxy Its size is about the size of the milky way

5. What is the importance of Supernova? Supernova plays a significant role in enriching the interstellar medium with higher mass elements the expanding shock waves from supernova explosions can trigger the formation of new stars

6. Types of Supernova There are two common types of Supernova: Ia II

7. Type Ia Supernova This supernova is the result of the activity of a couple of stars; one of which is a type of star known as “White Dwarf” White dwarf is a star rich in carbon and oxygen.

8. Type Ia Supernova The “White Dwarf” absorbs matter from the companion and therefore its mass increases, When the density of the core of the White Dwarf reaches a critical density of 2 x 10 9 g/cm 3 carbon and oxygen undergo fusion uncontrollably, and therefore the star explodes

9. Type II Supernova This occurs in a star which is in the verge of death At this point of time, there is no fuel in the star to burn, and there is so much accumulation of iron inside the star. Due to the weight of iron, the star fragments and collapses

10. Mechanism of Supernova Ia

11. Mechanism of supernova: Onion Layers

12. Mechanism of Supernova

13. Other Types Other types of Supernova are: Ib Ic IIP IIL

14. What happens when Supernova occurs? - 1 A supernova can radiate as much energy as the Sun could emit over its life span.

15. What happens when Supernova occurs? -2 The explosion expels star's material at a velocity of up to 30,000 km/s (a tenth the speed of light )

16. What happens when Supernova occurs? -3 The material coming out of a Supernova produces a shock wave into the surrounding interstellar medium . This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant .