reply to post by Char-Lee
Does friction exist in deep space?
Yes, when two surfaces rub together in outer space, there will be friction. Friction is a surface effect and doesn't depend upon there being air.
There is also a force like air resistance from the very sparse gas in space, but it will be very, very small, since space is a very good
Are being clever or just arguing semantics to continue the level of foolishness this thread contains?
I was replying to the following post:
^ Look at that heat shield. Or some type of shield. It's obviously experiencing friction.
That wouldn't happen with Mercury.
They are suggesting that the reason the object is bright is because "it's obviously experiencing friction". Anyone with a modicum of intelligence
would deduce that such an opinion would be based of something familiar, like a shuttle re-entry which from friction of the atmosphere causing the
protective coating to get red hot.
We know the object is in space, therefore in the context they are speaking about, it is not plausible. The object does appear
to pass through
the corona but:
The pressure and density in the corona is much, much lower than in Earth's atmosphere.
The Sun does have an atmosphere, two of the upper two layers being the chromosphere and then the corona. (Not including the heliosphere) The corona is
exactly what the sat is imaging. The object, maintains it's luminosity before it enters the frame of Stereo, and does not increase drastically while
passing through the corona (Although it is not actually passing "through" it, rather, behind it.) We can posit from this, it is not actually moving
through the corona, where it would be causing the the object to "Illuminating its own".
reply to post by JrDavis
Now it has 2 heat shields? Receiving friction from both sides?
So yes, you may argue semantics. There is friction in space, I was not implying that two objects rubbing together have no friction while they are out
there. I was merely analyzing what the poster was trying to convey and addressing that in my response.
"There is no friction in that region of space as there is in the atmosphere on Earth." Would that have been more appropriate?
As far as the very sparse gas littered throughout the universe, it too, is not even close to the atmosphere, or capable of causing enough friction to
make a "object that is not mercury" as the poster suggests, turn beet red. (Please leave this one at this point, you can argue if a ship is travelling
near light speed, etc... But I'm pointing out now that now, so I will decline to comment on semantics for the rest of the thread.)
11-12-2012 by boncho because: (no reason given)