July 17, 2019, 02:38:24 PM

Author Topic: Mars: Inside SpaceX  (Read 4280 times)

Offline Rick Nasher

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Offline meems

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Re: Mars: Inside SpaceX
« Reply #61 on: January 02, 2019, 12:49:49 PM »
>... sustain stress equal of 9 to 12 asian elephants standing on that suit unwrapped.

Its a bit misleading to think of it that way. A better way to think of the pressure difference of space vs sea level vs a car tyre. As it happens,
 space vs sea level is about the same as sea level vs car tyre, about 15PSI
 roughly,
 space = 0 psi
 sea level = 15 psi
 car tyre = 30 psi

so a space suit needs to be as pressure sturdy as a car tyre. That is within reason. Car tyres have a lot of redundant capacity : the exploding ones on youtube are at about 200 PSI.

Offline Henri

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Re: Mars: Inside SpaceX
« Reply #62 on: January 02, 2019, 02:02:50 PM »
I think that the tire analogy is appropriate, as it seems, according to wikipedia, early pressure suits were developed in tire companies like BFGoodrich and Goodyear.

https://en.wikipedia.org/wiki/Pressure_suit

Trivia:  U-2 spy planes operational altitude was roughly 20 km. Atmospheric pressure is less than 1/10 at that level (http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/hght.rxml).

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Offline Naughty Alien

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Re: Mars: Inside SpaceX
« Reply #63 on: January 03, 2019, 08:02:29 AM »
..and here they are, ISS gang...on the wires...


Offline GaborD

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Re: Mars: Inside SpaceX
« Reply #64 on: January 03, 2019, 08:34:54 AM »
This thread is going places.   :P



Offline therevills

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Re: Mars: Inside SpaceX
« Reply #65 on: January 03, 2019, 09:16:28 AM »
..and here they are, ISS gang...on the wires...

Oh please don't say you believe tripe in that video...

Offline meems

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Re: Mars: Inside SpaceX
« Reply #66 on: January 03, 2019, 01:06:42 PM »
@therevills
>Oh please don't say you believe tripe in that video...
nothing says " i refuse to watch it, so I'm not in a position to judge it " more than comments like yours

I love how the nasa hoax conspiracy has split online communities. Any hobby or work forum has for and against. Some forum ban one side, some the other, some forums ban discussion of it altogether.
Either you're skeptically minded or not, the nasa hoax is a good test. We all grew up with 100% belief that what the TV box told us was true. It takes a special resource of mind to be able to go back and question and potentially reject bedrock beliefs that were instilled in us at a young age.

Offline ThickO

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Re: Mars: Inside SpaceX
« Reply #67 on: January 03, 2019, 09:05:26 PM »
Here you go !!  ;D
3D makes my head hurt...

Offline therevills

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Re: Mars: Inside SpaceX
« Reply #68 on: January 03, 2019, 10:50:49 PM »
@therevills
>Oh please don't say you believe tripe in that video...
nothing says " i refuse to watch it, so I'm not in a position to judge it " more than comments like yours

I did watch it fully and I judged it tripe... so dont assume I refused to watch it.

I am for questioning everything, that is one of the basics of good science but there is a line of what/who you believe and the conspiracy theories out there.

In more proper science news, the Chinese Chang'E 4 landed on the "dark" side of the moon:





And a video of the Chang'E 3 from 2013:


Offline Xerra

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Re: Mars: Inside SpaceX
« Reply #69 on: January 03, 2019, 11:13:33 PM »
And, in other exciting space-related news, we also got our most detailed image yet of Ultima Thule which has been flying around the Kuiper belt for the last 8 million years or so. New Horizons flew over it, at around 17,000 miles, on New years day. It's so far out now that it's going to take around 18 months to receive all the data from the fly-by.

The data from the Pluto fly-by in 2015 took around 15 months to receive it all when it flew over in 2015.

Ultima Thule has topically been nicknamed the Snowman as it's two objects that collided and stuck together thousands of years ago.


Online Steve Elliott

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Re: Mars: Inside SpaceX
« Reply #70 on: January 03, 2019, 11:16:07 PM »
Why didn't the Chinese send men there?  Oh yes.   ;D
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Offline Henri

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Re: Mars: Inside SpaceX
« Reply #71 on: January 04, 2019, 07:58:30 AM »
Quote
Why didn't the Chinese send men there?

They are planning to. But so are others.

There is at least one commercial reason to go there and that's the abundance of helium-3 https://en.wikipedia.org/wiki/Helium-3 .
Helium-3 is the best candidate to be used as a fuel for a fusion reactor.

One is currently been built in France https://en.wikipedia.org/wiki/ITER .

-Henri
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Offline meems

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Re: Mars: Inside SpaceX
« Reply #72 on: January 04, 2019, 12:35:32 PM »
Quote
In more proper science news, the Chinese Chang'E 4 landed on the "dark" side of the moon:
Those orange photos can be immediately ID'ed as stage productions. There is fall off areas to the side of the photos - less bright on the sides of the set, a clear cut sign of stagelighting that all college educated stagecraft people spot instantly but top physicists are often blind to. If it was sunlight there'd be no fall off areas. Also the 2nd photo has a distinct 'hot spot ' a brighter lit patch in the middle of the set which indicates a stage light is pointing at it.

The apollo photos were replete with these stagelight artifacts, with fall off and hotspot areas in most of the photos. Believers cooked up all manner of excuses, most usually offshot astronauts and artifacts acting as light sources and when all else fails they just say ' light acts in unknown ways on the moon' .

can u see the hotspot and fall off areas in the classic 'man on the moon' photo?

Offline therevills

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Re: Mars: Inside SpaceX
« Reply #73 on: January 04, 2019, 10:52:26 PM »
So the Chinese are also included in the conspiracy too?!?  ;D

If it was sunlight there'd be no fall off areas. Also the 2nd photo has a distinct 'hot spot ' a brighter lit patch in the middle of the set which indicates a stage light is pointing at it.

It looks to me that the photo was taken at night on the moon and the spot light is coming from a light mounted on the lander itself...


Offline meems

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Re: Mars: Inside SpaceX
« Reply #74 on: January 05, 2019, 12:01:30 AM »
>It looks to me that the photo was taken at night on the moon and the spot light is coming from a light mounted on the lander itself...

Exactly!  ;)
Buzz and Neil were alleged to on the surface for only 125 minutes for that 1969 mission. The whole of that 125 minutes was alleged to be in lunar daytime. But the photos tell a different story...