Originally posted by internos
Here is it
This really puzzled me for a long time.
I think that a good question would be how can it change direction?
I mean, what forces could have brought it to change path? Could it have been some kind of inertial reaction? This is a very important point, in my
opinion, because it would provide a possible explanation to many, many videos that have been debated here
Yup, that's the one! Thanks.
The flash that you see is an automatic shuttle thruster firing. Thrusters are used by the shuttle to maintain attitude or to move to different
attitudes when required. There's typically a few degree deadband that the shuttle's computers will control to - if it hits a attitude error of ~5
degrees (modifiable) in any axis, thrusters will fire to correct the orientation.
As mentioned above, the shuttle sheds quite a bit of ice from different places. It's required to regularly dump water overboard (a byproduct of the
fuel cells), uses a FES (Flash Evaporator System) to reject heat before the radiators are deployed, and even expels human waste. All of this stuff
freezes almost immediately upon hitting vacuum.
The object that you see trending right to left (object 1) is likely frozen crap (figuratively or even literally) that came off the shuttle. The flash
is definitely form the hypergolic combustion of some nearby thrusters. While the flash is initially visible, the bulk of the thrust comes in the
moments after as the fuel begins to burn. That expansion of gasses is what caused the change in direction of object 1 and made it accelerate. Object
2 which appears to shoot past object 1 could be more ice or the clumped up residue that collects in the thruster manifolds (unburned fuel that
freezes).
[edit on 4-5-2008 by Credulity Kills]
[edit on 4-5-2008 by Credulity Kills]
[edit on 4-5-2008 by Credulity Kills]