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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 |
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Red Tesla Roadster mounted on PLA
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#23
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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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