Supernova



If a bright star burst into view in a corner of the night sky which was not there just a few hours ago, but now it burns like a beacon.  That star was not actually a star, but is the brilliance of explosion of that star when it has reached the end of its life known as supernova.
A supernova is an event which takes place in the space due to explosion of star. It is the biggest and largest explosion that humans have ever seen. Each of such blast is super-powerful, extremely bright explosion of a star. Energy of supernova is that high that it can outshine entire galaxy for a short time and can radiate more energy that sun will in its entire lifetime. Supernovas are often seen in other galaxies.  Supernovas are difficult to seen in this milky way galaxy due to dust particles which blocks the view. Supernova was last observed in the Milky Way in 1604 which was discovered by Johannes kepler.  Remains of most recent supernova were discovered by Chandra telescope developed by NASA. The supernova was exploded in milky way more than a hundred years ago.
Types of supernovas
1. First type of supernova is caused by a last stage of a dying massive star. This happens when a star with a mass at least five times more than sun bursts with a massive explosion. Those massive stars burn huge amount of nuclear fuel at their centers or core. This burning of fuel produces tones of energy due to which center of star gets very hot.  This heat generates huge amount of pressure in the bucleus of star and keep star from collapsing.  At this stage of life, star is in balance with the two opposite forces i.e. gravitational force which tries to squeeze the star into tight and smallest ball possible but pressure in the nucleus exerts a strong outward force. These two opposite forces resist each other.
When this star runs out of fuel, it cools off. Due to this, pressure drops in the inside. Gravity wins out,  and the star collapse suddenly. This collapse happens so quickly that it creates enormous shock waves. Those waves cause outer part of star to explode.
 Dense core with an expanding hot gas cloud is usually left behind called nebula.

 A supernova of a star with size more than 10 times than that of sun can leave densest objects in the universe behind called black hole.

2. A second type of supernova can happen in systems where two stars orbit one another and at least one of those stars is an Earth-sized white dwarf. A white dwarf is what's left after a star the size of our sun has run out of fuel. If one white dwarf collides with another or pulls too much matter from its nearby star, the white dwarf can explode. Kaboom!
How should you start UPSC/IAS Preparation?
Every IAS aspirant has one question in common i.e., how to start preparing? It is truly a concerning question. With increasing coaching institutes and a plethora of materials available online and offline, their worries are only compounded. We at gurmag  (www.gurmarg.com) believe that it is very important to address such basic queries of all fresher’s.

GURMARG EDUCARE provides free IAS online coaching, guidance, strategies, online study materials and mock tests with a vision that no candidate should be left out of UPSC exam competition due to the unavailability of expensive IAS classroom coaching. Now, you may go through our advice listed out . We hope this guidance-post to be equally helpful for everyone who is confused – beginners or veterans.
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