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Red Tesla Roadster mounted on PLA



 
 
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  #21  
Old December 26th 17, 07:14 PM posted to sci.space.policy
Fred J. McCall[_3_]
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Default Red Tesla Roadster mounted on PLA

JF Mezei wrote:

On 2017-12-25 20:29, Fred J. McCall wrote:

No, and in point of fact 'space' is generally not at 'zero pressure';
it is just very, very, very low pressure. There is typically 1 atom
of gas per cubic meter in space. Your 'blob of gas' is going to
dissipate to that level.


But is that not 0 PSI in terms of air not exerting any pressure against
any "wall" ?


No, it's not zero. It's just very, very low; 1.322 × 10-11 Pa.


On earth, gravity pulls air down whichn exerts 14.7 PSI onto the
ground/sea surface. On the ISS, the air exerts pressure against the
walls of the pressuve vessel.

But out in space, since the gas can expand to whatever it wants, is
there "pressure"?


Asked an answered. If there is gas, there is pressure.


Yes, if you have a ship with a flat front moving through a blob of free
floating air, pressure is created as it accelerates/hits those atoms.
But otherwise, is there really any pressure ?


Unless you are at absolute zero, gas molecules don't just sit. They
move around. That moving around is 'pressure'.


--
"Ignorance is preferable to error, and he is less remote from the
truth who believes nothing than he who believes what is wrong."
-- Thomas Jefferson
  #23  
Old December 29th 17, 05:59 PM posted to sci.space.policy
David Spain
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Default Red Tesla Roadster mounted on PLA

On 12/25/2017 9:24 AM, Jeff Findley wrote:
https://www.space.com/39164-elon-mus...-heavy-rocket-
photos.html

From above:

"Musk has said that Falcon Heavy's first payload will be his
own midnight-cherry-red Tesla Roadster, launched on a
trajectory aimed for Mars orbit."

In other words, this sounds to me like a transfer orbit between earth
orbit and Mars orbit. My guess it will be chosen so that there is zero
chance of it actually hitting Mars or earth. So, it's just going into a
solar orbit.


There is also this Tweet from Musk on the subject, which I believe also
tends to confirm your speculation Jeff:

https://www.inverse.com/article/3976...eleted-twitter

Scroll towards the end of the article and you will see this quote:

quote
A Red Car for the Red Planet Test flights of new rockets usually contain
mass simulators in the form of concrete or steel blocks. That seemed
extremely boring. Of course, anything boring is terrible, especially
companies, so we decided to send something unusual, something that made
us feel. The payload will be an original Tesla Roadster, playing Space
Oddity, on a billion year elliptic Mars orbit.

-E. Musk
/quote

Dave
 




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