Question: What happened to the SpaceX Starship SN11?
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As per the live streams held on YouTube, I want to know what really happened to SpaceX Starship SN11

The live streams show a lot of smoke and others show some camera footage, even others say it blew up in the sky.
And other people even say that there was an issue with the 2nd raptor engine

What is really going on here?

* Did it blow up in the sky?
* Did it blow up on the launchpad?

Why did it crash?
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1. **Computer code error**

SpaceX uses computers that run on code(correct me, anyone, if I'm wrong
here)and the SN10 flight was successful (even though it came down with quite a
bump!) so we can assume that SpaceX used the same code but altered it a bit so
they instructed the computer to reduce the velocity so it wouldn't come down
like SN10.

But there was an error with the code
2. **Raptor/s issue/s**

Or we can assume that the computer ran the code correctly, but there was a
raptor issue as shown by the fire here

[![](https://i.stack.imgur.com/LyxCU.png)](https://i.stack.imgur.com/LyxCU.png)

3. **It was caused by the fog**

Or we can also assume that everything went well but the landing wasn't
possible due to the fog. The computer could not calculate and made a botched
landing attempt
4. **Or there was/were some other issue/s**

***So which of the four was it?***

1. Computer code error
2. Raptor issues
3. Bad weather caused by the fog
4. Some other problem/s

Other suggestions and answers other than the given 4 are also welcome!

Please note that i prefer detailed answers

Answer: 
> 
> What happened to the SpaceX Starship SN11?
> 
> 
> 

It's fairly apparent that what did happen is that it exploded in the fog during its descent. It's far too early to know why this happened. Lots of people who were there reported seeing falling debris. Eric Berger at arstechnica.com [wrote](https://arstechnica.com/science/2021/03/spacex-loses-another-starship-prototype-as-landing-sequence-fails/)

> 
> All we really know for sure is that at 5 minutes and 47 seconds into the flight, one of Starship's three Raptor engines relit to begin the final landing sequence, and then the engine-bay camera cut out in SpaceX's webcast. Contact with the vehicle was lost, at least in terms of live video pictures. Shortly after this, pieces of the Starship vehicle began raining down on the launch site, and there were reports of a series of small explosions.
> 
> 
> 

Eric writes cautiously, and he rarely speculates or conveys unfounded rumors. (There are rumors galore on this.) Eric did report on one photographer he knows (Eric knows lots of people) who was on the scene and saw the thick sea fog. The photographer drove inland a ways where he might have a better view when the vehicle ascended above the fog. He did have that view; the linked article shows pictures taken by that photographer of the vehicle ascending above the fog and performing its belly flop. (Note: I am not posting those images here because those pictures are copyrighted by a professional photographer.)

Eric did make one implicit speculation in the article:

> 
> It is not clear whether the vehicle's flight termination system was activated to destroy the Starship before it veered off course. However, the remnants of the vehicle landed near their intended target.
> 
> 
> 

The vehicle's automated flight termination system certainly is a possible culprit; the AFTS's one and only one purpose to make the launch vehicle explode. There are however many other possible causes for a launch vehicle undergoing rapid unintentional disassembly.
A recent [tweet from Elon](https://twitter.com/elonmusk/status/1379022709737275393) says that:

> 
> Ascent phase, transition to horizontal & control during free fall were
> good.
> 
> 
> A (relatively) small CH4 leak led to fire on engine 2 & fried part of
> avionics, causing hard start attempting landing burn in CH4 turbopump.
> 
> 
> This is getting fixed 6 ways to Sunday.
> 
> 
>