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SpaceX NASA returning human spaceflight to United States today (canceled)

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Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#152

Earlier quoted context omitted.

As long as other nuclear powers exist - there will be cold wars. There are two alternatives... 1. Non-nuclear hot wars. 2. A single global authority.

We didn't have a cold war last 20 years, except some in the US still maintaining a cold war mentality.

Notably, there was a single global hegemon that bombed and invaded countries at-will during that time period.

Now another pole rises in China and so a return to a "cold war" like system is possible. Personally, I hope we can come to an arms control limitation with China. In 20-30 years, even force parity will be charity on their part.

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#153

Earlier quoted context omitted.

As long as other nuclear powers exist - there will be cold wars. There are two alternatives... 1. Non-nuclear hot wars. 2. A single global authority.

Sticks and stones.

Disarmament on the global scale, sure. Won't go that far, for practical reasons - we'll still need knives and fusils de chasse.

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#154
post #45
post #8

Earlier quoted context omitted.

The space suits, UI, design of it all feels exactly what I’ve though the future of space technology would be. Maybe not all the way there yet, but a great leap from hundreds of manual switches and raw aluminum of the shuttle era.

> a great leap from hundreds of manual switches and raw aluminum of the shuttle era. Wonder if reliability of virtualized controls surpasses the one of dedicated hardware though. I suspect one of the reasons Apollo computers were all built with just one type of logical chip is the ability to replace faulty parts - one just need a single type of replacement. If for some reason touchscreen malfunctions, what options ar…

> I suspect one of the reasons Apollo computers were all built with just one type of logical chip is the ability to replace faulty parts

The Apollo Guidance Computer was built with two types of chips: a 3-input NOR gate and a core memory sense amplifier. The reason to use just one logic chip was because ICs were very new at the time and there was very little reliability information. By standardizing on a small number of components, they could procure enough to determine and maintain quality. (See Journey to the Moon chapter 12.)

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#155
post #60

Earlier quoted context omitted.

I wonder if the touchscreens are made of diverse hardware types and run by different programs running on different types of CPUs. If it's all common hardware and a common code-base then one in-common hardware or software failure could still take them all down.

I know the space shuttle employed multiple redundant computers of differing hardware as failsafes. I can't imagine SpaceX didn't do the same thing.

For redundancy, the Space Shuttle used five of the same computer (IBM AP-101). Four of them ran the same software, while the fifth ran independently-developed software in case a bug prevented the others from working.

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#156

Earlier quoted context omitted.

I think that your insinuation that a significant number of those sci-fi aesthetics were implemented at a detriment to usability or safety is completely incorrect.

Could you please elaborate more on why it is completely incorrect? I think the opposite from what I've seen. Touch screens in a space capsule cockpit with UI and fonts that appear to be more of a pizzaz than functional. I think that SpaceX has leaned too much towards decoration while presumably sacrificing a tremendous amount of functional aspects. I don't know for sure because I've not operated those systems but I'v…

Sure, I'll expand.

We both have limited information.

I assume that the professionals at SpaceX and NASA have prioritized safety and usability, while also introducing a sci-fi vibe. This is a reasonable position.

You, however, take a conspiracy theory (the literal definition) angle that SpaceX have reduced the safety and usability of their module in order to look cooler. Do you see why this is not a reasonable position with the information that we have?

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#157
post #147

Earlier quoted context omitted.

It's the first manned launch on the Dragon platform. There have been a number of unmanned launches and tests, but no where near as many as on Soyuz. A quick search through Wikipedia shows 140+ manned Soyuz launches, and around 20 total for the SpaceX Dragon. Note those numbers are for the spacecraft, not the booster (the Soyuz platform has both the spacecraft and booster named Soyuz, SpaceX has the Dragon spacecraft…

This is the Dragon 2, it has flown twice, once to the Station and back. A second time where the rocket was blown up to test the in-flight abort system. It is pretty different from the 20 Dragons used on CRS.

True. I looked around for an explanation on what changed, and couldn't find anything super specific.

I expect a decent number of systems were reused or modified, rather than being fully original

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#158

Are the space suits also designed by SpaceX?

Yes they are both designed and made by SpaceX. There was a short segment about them in the official coverage.

Wow. Are these suits comparable to the ones worn by Apollo astronauts?

Re: SpaceX NASA returning human spaceflight to United States today (canceled)

#160

Earlier quoted context omitted.

As long as other nuclear powers exist - there will be cold wars. There are two alternatives... 1. Non-nuclear hot wars. 2. A single global authority.

We didn't have a cold war last 20 years, except some in the US still maintaining a cold war mentality.

> We didn't have a cold war last 20 years

That's solely because the USSR collapsed and Russia is only a regional power, not a superpower. Russia has a small, weak, backwards economy that is of modest global consequence. It severely limits their capabilities. Russia's position on the global stage is still eroding. Had the USSR somehow survived and continued to this day, the Cold War would not have ended. Putin as an authoritarian dictator-for-life is unable to push his view of how things should be, onto very much of the rest of the world. Putin is boxed in, contained, by Russia's various weaknesses.

The contrast could hardly be greater with China, which is clearly going to be far beyond anything the USSR ever accomplished in most every sense (from financial/economy to technology to military to global influence).

China under Xi has chosen an aggressive authoritarianism domestically and a so-called Wolf Warrior policy internationally. They continue to push forward ever faster in those directions, rather than turning back. The fundamentally conflicting world-views, democracy vs dictatorship, market economies vs arbitrary command economy, liberal vs regressive, human rights vs lack of human rights, is why we're entering cold war round two. China's position under Xi on nearly everything is fundamentally incompatible with the rest of the world continuing to make liberal progress. Something has to give when those two visions meet, and that thing will guarantee a new cold war that will split the planet in half.

Go down the long list of liberal ideas & topics, and look at where China stands, and then consider where the world should ideally stand. China stands opposite nearly every liberal idea you can name. There's your cold war, and nothing can stop it short of China resuming the brief period of modest liberalization they underwent before Xi took over - or the world giving up all the liberal progress it has made post WW2.

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