1. What is a supernova?
2. What causes the supernova to blow up?
3. How often do they occur?
4. What happens after the explosion?
5. How bright are they?
6. How many types are there?

A supernova or supernovae are vast explosions in which a whole star is blown up.Supernovas occur in distant galaxies and they light up the whole galaxy.Scientists think suprnovas occur every one hundred years in distant galaxies.

What causes the supernova to blow up is that gravity gives the supernova it's energy. Once the core has gained so much mass that it can't withstand it's own weight, the core implodes. When the collapse is stopped by the neutrons, a bounce happens and explodes.

Supernova explosions are relatively rare events in our own galaxy,happening once a century or so on average.

What happens after the explosions in which the ejected material continues to expand in a shell around the progenitor while type 2  suprnovae, the central star remains. The ejecta continues to expand for thousands of years until they impinge on gas and dust clouds.

Supernova increases in brightness only by a few thousand times and some occur in our galaxy every year.Supernovas are extremely bright lasting for a few days and the combined light output of all the rest of the stars in the galaxy.Supernova remnant the expanding glowing remains from a supernova.
 

There are two types of supernovas, which are type 2 and type 1. How the supernova type 2 occurs is that the structure of all stars is determined by the battle between gravity and radiation pressure arising from internal energy generation. In the early stages of a star's evolution the energy generation in it's centre comes from the conversion of hydrogen and helium.
Type 1 is even brighter objects than those of type 2. The origin of a type 1 supernova is old, evolved binary system in which at least 1 component is a white dwarf star. They represent the final evolutionary stage of all low-mass stars.
Type 2 supernova are possible  exlosive stars in the massive highly stellar core rapidly implodes then explodes destroying the surrounding star. Type 1 supernova of a star collapses and temperatures become high enough for carbon fusion to occur.Dying stars is the beggining of supernovas.

Distant supernovas occur in our galaxy and you can tell whether the star is dying or not.Stars are more massive than our sun and can quite evolve into a white dwarf.
White dwarf stars are one of the most dimmest stars in the galaxy.

Supernovae occur at the end of a massive star's lifetime when it's nuclear fuel is exhausted and it is no longer supported by the release of nuclear energy. A binary star are two stars thet orbit around a common centerof mass.An x-ray binary is a special case where one of the stars is a collapsed object such as a whole white dwarf, nuetron star or black hole.

There are many supernova information you can find throughout the internet.I think supernova explosions are interesting to see, and to learn about.I learned that supernovas are just dying stars waiting to explode.I also learned that supernovas rarely occur only in distant galaxies and that there are two types of supernovas or supernovae.In my opinion, I think soon there will be a supernova explosion occuring in the Milky Way galaxy.Stars form out of especially dust clouds of gas and dust. A globe of this matter grows as it keeps sweeping up surrounding matter by gravitational attraction.A star like our sunis born inside a huge cloud of gas and dust.;gravity condenses part of the cloud into a warm red protastar.

Bibliography:National Geographic Picture Atlas Of Our Universe by RoyA.Gallant copyright 1980