Several billion years after its life starts, a star will die. How long a star lives depends upon its mass. Oddly, the bigger they are, the quicker they die cos the more mass a star has, the hotter it gets... and the hotter it gets, the quicker it exhausts its fuel supply.
A star expands as it grows old. As it's core runs out of hydrogen and then helium, it contracts and the outer layers expand, cool, and become less bright. This is a "red giant" or a "red super giant" phase (depending on the initial mass of the star). It will eventually collapse and explode.
A star will become either a "black dwarf", "neutron star" or "black hole", depending on how massive it was to begin with...
- Sun-like Stars (with mass under 1.5 times the mass of the Sun) : Red Giant > Planetary Nebula > White Dwarf > Black Dwarf
- Huge Stars (with mass between 1.5 to 3 times the mass of the Sun) : Red SuperGiant > Supernova > Neutron Star
- Giant Stars (with mass over 3 times the mass of the Sun) : Red SuperGiant > Supernova > Black Hole!
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Wikipedia is really smart.....
How can we take a picture of Black hole.
Black hole absorbs all the energy, including light...
So how is it possible....to know the existence of black hole.
Desert Fox said...
7:47 PM
Desert Fox said...
7:47 PM
well, that way wiki has everything possible... you dont have to even goto elementary school :)
taking a photograph of a black-hole would be like taking a shot of nothing surrounded by something... just like the one i have on the blog.
the boundary of the black hole called the 'event horizon' has been known to be a concentric axis of revolution of many objects. so it would be like earth around the sun, except there is no sun, but a black hole.
premal said...
8:31 AM
Ok, after reading this here are my thoughts....the sun is a star...I believe it is the biggest star. This means it must have the most mass and therefore will be the first of all the stars to die. If the sun dies what happens to us? Will the whole universe get engulfed in the black hole that the sun will create?
deepa said...
9:40 AM
no, sun is not the biggest star... read "sun-like stars end up as 'black dwarfs'... only stars that are 3 times the size of sun or greater end up as black holes."
premal said...
10:14 AM
What happens in black hole? Where does the energy goes in Black hole? According to the universal energy conservation: energy cannot be destroyed or created, its just changed from one form to another.
So if all the energy is absorbed in the Black Hole than, IS Energy Destroyed?
Desert Fox said...
11:05 AM
what are you talking about? read more on black holes in your wikipedia :)
anyways, in simple words, 'all energy' is not absorbed in a black hole... a black hole is still matter (not vaccuum) but the reason you cant see it is bcos the mass of the original star compressed into such a dense form thru the process of 'gravitational collapse' that its gravitational pull is much higher than that of earth or any other system.
for example, when a space shuttle needs to go into outer space from earth, it has to oversome something called the 'escape velocity'... now, for a black hole, this 'escape velocity' is so high that even light cannot escape, cos of it's high gravitational pull... if light cant escape, you cant see it!
premal said...
12:57 PM
go winkipedia. Man u guys are studying some good s*** here. keep it up i am just not going to talk about something that i dont on top of my head so have fun though i will popping in and out for fun.
Tulan said...
1:54 PM
Your Black-hole topic has become A-hole.
You need to update your weak blog.
Desert Fox said...
3:01 PM
Update your blog.
do I have to do this everyday?
Desert Fox said...
4:11 PM