saberdancer

The guy loves to jump on and off the hype train.

I guess he just now read the paper properly and found some inconsistencies.

I'd wait for people to try and replicate. It is obvious that the paper was not ready and has mistakes.

Plus apparently they worked on it for several years, you don't have a terminal unplugged for a year.

I completely agree. I see many people commenting that the document has bad grammar or charts, completely ignoring that they probably authored it in Korean. Also looks like Kwan and HT Kim are fighting who gets to be 3rd Nobel winner so any problems with quality of the layout are easily explained by this.

One thing that is a green flag in my opinion is that apparently they had a sample for a long time (year+) so I find it unlikely they made an obvious measuring mistake.

But as always, most would love to have this be true and sometimes this gets better of us.

Pretty sure I read this comment somewhere else (not attributed to Max Planck Institute), I think it was a guy on reddit.

Maybe they are the same but could be just copy paste from Reddit.

LK-99 is claimed to be room temperature and pressure.

I've seen that point brought up during a conference tech talk and when asked, most of the audience raised their hands up saying they would fly on a Space Shuttle regardless.

They have inertial navigation system.

There are videos of them building it. From what I remember, they rolled carbon fiber around a cylinder, making the flat part of the cylinder. Then they mated two titanium half spheres to the end of the carbon fibre cylinder. This was done using some kind of "glue". Meaning that the middle part had no titanium.

I think it was in Sub brief YouTube video. https://www.youtube.com/watch?v=4dka29FSZac&pp=ygUJc3ViIGJya...

I'm curious if the window remained intact. This seemed like a logical failure point.

San Juan was 2300 tons and is made of metal.

Titan was 10 tons and mostly made of carbon fibre.

Their bodies are also pressurized at 1 atms, after being exposed to 400 atms they instantly died. My guess is that they were effectively vaporized/liquified.

Much better way to go then suffocate in darkness.

No, controller on Titan is for movement as he talked about it (they don't have a periscope).

But he also mentioned a touch screen when talking about the controller so I bet that they can use the touchscreen to control the submarine as well.

Still most likely cause of failure is that the viewport failed and they died immediately.

I also thought they suffocated but it seems more likely that they died in a fire.

"Analysts concluded that 23 sailors took refuge in the small ninth compartment and survived for more than six hours. When oxygen ran low, they attempted to replace a potassium superoxide chemical oxygen cartridge, but it fell into the oily sea water and exploded on contact. The resulting fire killed several crew members and triggered a flash fire that consumed the remaining oxygen, suffocating the remaining survivors."

This looked exactly like my problems in KSP. Rocket starts to be uncontrollable, I try to separate, previous stage is still under thrust which means I am unable to separate and then boom.

It even spun like a KSP rocket.

From what I understand that was already planned - this was only launch without it.

NSF on their stream did talk that this is the only launch that will be done without water system - my understanding is that it would be used during launch to reduce damage to the pad.

Not for Falcon 1. He said he believes they have 90% chance of a successful launch.

After that they had 3 failed launches and company almost went bankrupt.

They have to reserve airspace and "sea space" so no one can stumble under the path of a rocket which may explode.

They have to empty the town nearby, close roads, etc.

They also arranged a NASA plane to come and observe.

It is the same idea that they had for a Space Shuttle. Reusable vehicle that can be used many times and make space accessible. Unfortunately, Space Shuttle did not make that a reality as it was too complex and required a large multi month refurbishment after each mission.

Starship should be able to solve that issue and make space accessible. At least that is the idea. We will see how it ends up.

Not a big setback at all. They would have to analyze reasons for failure and make changes. There are no serious "reusability" competitors, especially at Starship size.

SpaceX is trying to iterate quickly on this rocket so they have several already assembled. Next two launches will also be fully expendable.

It is the largest rocket in history and it is planned to be fully reusable.

If SpaceX manage to make this work they will have a launch vehicle capable of launching much more mass to orbit which will open up space exploration.

Cost saving as there is no prestige or gain in coming fast or first. Probes are also bigger and heavier.

It's quite different incentive when you play for free - why waste your time dodging shots when you can fight but if you were playing in an arcade, some players might try and prolong the experience and enjoy the challenge of evading shots.

Better to think of expansion as being a 2D dot on a balloon.

As balloon expands, in all directions there is same rate of expansion. You are not inside the balloon close to one side to observe the difference.

Problem that I see with dark matter is that it is unfalsifiable.

If you can have arbitrary amounts of dark matter in arbitrary positions - how can you falsify that?

Thank you for your service. I follow the Twitter account and I am always amused when I see what a naughty boy Samuel was. Seeing various people join in and comment, with a weird sort of "meta" that was created around it is always a pleasure.

Seeing these longer diary entries I wonder does the Twitter account publish full content of the diary entries or just selected parts?

It may be more exciting and visually attractive but it misses all the things that make Mars colony interesting.

Venus airship will be unable to get raw materials - you are effectively making a space station in atmosphere of Venus. You can only capture gases and get energy from sunlight. You can't mine.

Energy efficiency vs outdoor farming with Sun is not applicable to any Mars colony.

You can be very inefficient if it is your only method of producing food.

Hard thing in living on Mars is not the cold, it is the lack of oxygen or easily accessible water. All of these are abundant on Antarctica so it is not really a practice run.

I see little point in exploring this on Antarctica which is why I believe no one really is entertaining idea of this type of test run on Antarctica.

He was one of Musk believers that wanted to come in and help "fix" Twitter.