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Masks may be a net negative, all else being equal. Norwegian government does not recommend using masks, as they irritate and cause you to touch...
I believe the less aggressive strain never left China. What seems to be the case is that it takes a while before light symptoms become...
It was quite implausible to arrive in the middle of 2018, and my statement has since been proven correct. I think the most recent indications are...
What exactly can we learn on the moon that is both: 1. Applicable to mars? 2. Not doable in LEO (or on earth), which is even cheaper and faster?...
NASA has plenty of funding to go to Mars and/or the Moon. But they are forced to focus on silly things, like the LOP-G, and they are forced to pay...
In 2018, global car production was around 1.4% BEV. At a sustained 50% growth, the progression is something like this: 2019: 2.1% 2020: 3.15%...
True, I would guess the insurance cost for a hydrogen filling station is significant. Not only is the station itself quite expensive and not...
Yes. Hydrogen cars use 3-5 times more energy than BEVs when running on hydrogen produced by electrolysis. So, if the cost of solar is say 10...
NEL (the supplier of the hydrogen filling station that blew up) has closed down the other two stations in Norway and another 8 across Denmark and...
Ah, I don't think there are any official numbers on those.
81,000-212,000 lb, depending on throttle setting.
It's an interesting thought. I'm sure it would be possible to get more performance out of Falcon 9 and Falcon Heavy, but it would be an...
Maybe a little more than that. 48 tons CH4/LOX, 9 tons payload and 3 tons dry mass. Anything is possible. Though the changes would be so massive...
I can't quite figure out how they would be able to do 12 tons of payload to the surface of the moon using Falcon Heavy and NTO/MMH or kerolox...
If SpaceX allows unfiltered access to the internet in China, Musk will basically be blacklisted and can forget about doing business in China. Not...
Look at the table on page 5/6 here: https://sma.nasa.gov/LaunchVehicle/assets/spacex-falcon-9-v1.2-data-sheet.pdf The 22.8 tons is specified at...
I'm not sure exactly what altitude the 22.8 tons to LEO are specified for, but I think it's something like a 185 km altitude at 28.5 degrees...
Interesting photo. One thing I noticed, is the new PAF (payload adapter fitting). I believe the standard one has a maximum of 10,886 kg, and I...
Yeah, it isn't entirely straight forward to do the comparison. Recovering the center core of a Falcon Heavy is a bit like recovering the second...
Might make sense to include the Falcon Heavy pricing with expended center core. If you expend the center core, you're talking more like $110m for...
Might not be a result of the salt. Could be related to: - Zero G for several days - Vacuum for several days - Reentry heating - Splashdown...
I'm sure it's possible to design for deep throttling ability, if they really want to be able to hover. Maybe have some sort of bypass from the...
The only experiment I've seen the results of concluded EMF radiation was basically the same in an EV as in an ICE vehicle. Most of the radiation...
Also the reason provided by Cosmacelf holds true. For maximum fuel efficiency, you want to wait as long as possible before initiating the landing...
Was about to say the same thing, and it's still true, as far as I can determine. A single Merlin at 40% output still has around 38.4 metric tons...
It will count against SpaceX if it was something that's likely unrelated to the capsule having visited space. SpaceX needs to find the cause...
Fire or crash damage to a battery pack can cause it to catch fire, even days after the event. As can improper handling of the vehicle, like...
The thing is that if you use grid average electricity, a BEV will pollute maybe 50% as much as a comparable ICE vehicle. (Varies from place to...
Maybe SpaceX should just stop trying to recover the center core. There are some downsides to recovering it: 1. Center core needs more fuel for...
One can't know exactly what Tesla is and is not working on, but I think it's quite unlikely Tesla would be working on fuel cells. Fuel cells...
Yes, FSD can't be consider a preorder and refundable on that basis, for those who argued that, but Tesla has consistently said that FSD features...
I tend to agree they will fly. But it's certainly not set in stone. Given sufficient delays, NASA would cancel their contract. Though it seems...
I hope they can get away with something like 10 different shaped tiles, rather than every tile being different (like the space shuttle). For the...
That would be a crazy amount of gimbal range. Seriously doubt it. (And how would you realistically land with the rocket at something like a 20...
Doesn't look like that Raptor is centered. So will they install another one before the test, or will they do a small test where they aren't...
I think the rocket gimbaling can in fact slow down the rotation, as the rocket is not rotating entirely vertically. As long as the axis of...
Definitely. For one thing, the consequence of a failure would be approximately halved. If the first launch fails, you simply hold off on the...
Ah, right, forgot that. But if EM-1 is done commercially, I think chances are good SLS is SOL for the remainder of the launches.
Anyone really know what the Orion capsule does differently from Dragon 2? Seems like it's roughly the same size. Is there any reason (besides...
If Orion were to be sent up with crew, that would mean crew-rating the Falcon Heavy. Not sure if this is where SpaceX would like to direct their...
I haven't seen SpaceX specify anthing like that. But I would think you would want to wait as long as possible. Let the atmosphere do as much work...
Funny, I had the exact opposite reaction. Timed it to around 10 seconds between each callout, so about 10 m/s. That's still pretty fast - like...
Requires much less energy and space to simply carry heads. And then they just plug them into cyborg bodies on the space station.
Yes. Though one has to hope it doesn't happen again at a very inconvenient time. Like right before the landing burn!
I just use percent. And you'll get 3-5 km per percent with the X100D. So, if you have say 43% remaining, you can go between 43% x 3 km/% = 129 km...
Basically no carbon on the moon. But it is possible to produce hydrogen and oxygen from water on the moon, at least.
I thought the delta-V hit was less than that. But there can still be arguments for doing it this way. Assuming commercial launchers can *juust*...
The delta-V requirements to go from the LOP-G to Mars transfer is something like half that of going from LEO to Mars transfer. This means that you...
I don't think very much, if anything, is transferrable to a Mars mission. The architecture seems quite tailored to getting to moon surface. But...
SpaceX shouldn't focus on anything that would be a distraction from Starlink, Starship and regular launch services. But maybe SpaceX could do...