I simply can't understand it, can somone explain me why did obi wan...

Why did Obi Wan Kenobi disappeared after been hit by Vader's lightsaber?
And why did he let Darth Vader kill him? It has no sense!!!!!!!

that's the problem... it's the ghost trick...

GL said that to solve it, you had to "crack" this one...

"If you strike me down, I shall become more powerfull than you can possible imagen"

still, there is nothing final about todays theories, it will be explained in 2005, or so Mc Callum claims...

Most people think it has to do with the prophecy

The point is, Vader didn;t kill Obi-Wan. Obi-Wan faded first.

Obi-Wan knew that escape was difficult from where he was, and Luke and co were too busy watching him to move. He knew that if things came to the worse he could always do the ghost trick and carry on teaching Luke. And it suddenly occurred to him that he was actually better off doing it right there and then- VAder would think him dead, but in fact he was free to keeo helping Luke in ghost form!

And hence the Dark Side was outwitted.

and yoda and vader?

Yoda was just dying anyway.

How Anakin did it is the key to the mystery.

But all that isn;t important to this particular question, as to why Obi-Wan let Vader 'kill' him.

if it was "just dying" GQJ would have disapeared to, and if you can explain every of these jedis disappearing, you have it solved

How do you know he faded first?

because if he got hit by the sabre he would have been cut in two, reference to the Wampa, the alien in the Cantina who's name I forgot, etc.

Yoda died and then disappeared.

No, he disappeared before he died.

There was no contact made with Obi-Wan.

What are you talking about, Ush?

Yoda died. I don't know what movie you were watching. He was dead. He had his eyes closed and he was breathless.

I think that if they are prepared for their death, they can give themselves to the force and join the force completely just beforehand, whereas QGJ was not ready/expecting to die so he just died.

if that's so, it's a known trick amongst Jedi and Anakin/Vader would have known it, so he wouldn't be surprised in ANH

Unless, it's not widely known amongst all Jedi, only those Really strong or Jedi Masters, Anakin will not have been taught this and will not have been a Jedi Master, so obviously Vader will not have know either.

why wouldn't he know? Masters etc. die all the time, people wouldn know that, almost everyone would know that if it was true

I have another theory then, maybe it is something that only years of meditation would allow you to find, old Ben hidden away on tattooine was able to find the time and energies to find himself in the force more and thus find the answer on how to do this, Vader was just surprised that Obi-Wan was so much more in tune with the force that he imagined.

if you can reach it with years of meditation, it would also be found by others in the Jedi Temple, there are enough Jedi that meditate for long time, so people would also know about it

And that doesn't explain Anakin.

And people don't just die instantly like that, To. A person dying of old age, or even of disease, does not instantly die when he has just been talking. Yoda slipped into the Force before he died.

A person dying of old age, or even of disease, does not instantly die when he has just been talking.

Faded away and died before he disappeared? That makes no sense; you had him fade tiwce.

If you say your grandmothjer died like that then I can hardly contradict you but in 99% of cases people do not die from consciousness like that unless suffering a sudden death like an axe in the head or a car crash. You fall unconscious and then die later.

But anyway, it isn't that important and if you want to believe they died 'first' then feel free.

Anakin, meanwhile, was seen in ghost form and so almost certainly disappeared.