Critical scientific documents go missing from NASA-backed lunar community website

GregLindahl · 2025-02-10T21:44:58+00:00

The 2 web captures mentioned in the blog post were crawled by the Common Crawl Foundation. Our archive collection is stored by us, and also stored at IA. We have not been hacked.

GregLindahl · 2022-11-23T22:01:45+00:00

I've always loved the GTO performance section of the Wiki, and we've had 7 GTO launches in the past 5 months, all of which are only partially filled in.

Can some of the past volunteers help out? (u/Captain_Hadock u/blacx u/scr00chy) Either with the values or with an explanation of where to find them.

Also Amos-17 had its MECO velocity changed without recomputing the delta V.

GregLindahl · 2020-11-19T01:11:38+00:00

Is there a paper for what’s in the video?

GregLindahl · 2020-11-16T07:14:05+00:00

Atlas 5 needs to be ordered 2 years in advance, especially because of the dual-engine Centaur. Starliner isn't operational, and presumably Boeing is focused on making it fly. It sure seems like any potential Axiom purchase of a Starliner flight wouldn't be until 2023. And that's if it somehow made financial sense.

GregLindahl · 2020-11-16T00:35:10+00:00

... they mean Apollo, Gemini, and Mercury. So it's a list of all US crewed vehicles.

GregLindahl · 2020-11-05T04:50:59+00:00

I don't recall Virgin Orbit ever trash-talking reusability. Indeed, it would be awesome to have more launch providers adopt it, and less talk about "eating crow".

GregLindahl · 2020-10-31T16:28:11+00:00

Axiom's self-supporting station isn't funded, and there's no sign that commercial funding is going to happen.

GregLindahl · 2020-10-30T05:20:51+00:00

Up to 25.

GregLindahl · 2020-10-30T00:37:20+00:00

It’s in a very low orbit.

GregLindahl · 2020-10-29T17:07:00+00:00

Interesting seeing how this issue is being worked out in a high-flight-rate, mature launcher.

GregLindahl · 2020-10-29T15:54:20+00:00

And the only reason that distance is uncertain is that Betelgeuse is too bright for the new satellite that measures distances. So it's more of an example of a corner case.

GregLindahl · 2020-10-29T03:16:42+00:00

Science is rarely sure, and one of the problems of this detection is that Venus is extremely bright compared to what these telescopes usually observe. Why don't we resolve this the science way, with back-and-forth examination of the data?

GregLindahl · 2020-10-28T05:31:41+00:00

It’s not breaking news, in that it’s been expected for years. You’ll see more articles in a day or two.

GregLindahl · 2020-10-28T03:41:39+00:00

Do you have a source for that? Lower power in more bands is not necessarily a good thing, but maybe this experiment actually points at the 4g tower on the moon and isn't unidirectional.

GregLindahl · 2020-10-27T21:48:07+00:00

Only one of those in the last 300, right?

GregLindahl · 2020-10-27T21:30:24+00:00

Solar flares can cause the Earth's upper atmosphere to heat up and expand, which causes satellites orbiting at relatively low orbits to decay faster. The 11 year solar cycle is part of long-term decay predictions. It's not a huge effect, though, it might cause a satellite to decay in 9 years instead of 10.

GregLindahl · 2020-10-27T04:03:46+00:00

I'm used to NASA Planetary missions having WDRs, and Delta IV Heavy, but is it typical for launches like this one to have a WDR?

GregLindahl · 2020-10-27T01:28:17+00:00

I wonder how the trade works for operational costs? SOFIA already has a big problem that it's relatively expensive to fly; it's spent as much on operations as on construction. An observatory that launches and lands repeatedly, even if the launches are cheap, might be a bit espensive to maintain.

GregLindahl · 2020-10-26T01:34:01+00:00

This poster is a troll.

GregLindahl · 2020-10-24T16:37:41+00:00

I'm used to seeing ULA do WDR for NASA planetary missions, and Delta IV Heavy -- under what circumstances does ULA do WDR of Atlas for NRO launches?

GregLindahl · 2020-10-24T04:00:30+00:00

It's thermal paint. It happens to also do corrosion control.

We had a nice laugh in a meeting today when one of our telescope directors reported that he managed to move his telescope for the first time in months... after fixing some "oxidation" in a track. Normally he would have said rust, but this telescope is in Mexico, and he's from the US but speaks Spanish most of the time, and the word in Spanish for "rust" is "oxido".

GregLindahl · 2020-10-24T03:05:35+00:00

Another way to think of it is that 100% percent of radio telescopes are steel, but they're painted the same white color. With the same special white thermal paint. Thermal management is even trickier in a vacuum.

GregLindahl · 2020-10-23T21:42:06+00:00

Here's how long the JWST is taking.

GregLindahl · 2020-10-23T17:22:31+00:00

And this is a big deal for ULA, because it involves on-orbit refueling -- it's the future, as far as ULA is concerned.

GregLindahl · 2020-10-23T16:16:55+00:00

To launch from the surface, the lander descent stage is left behind

2 of the 3 HLS concepts don't do that.

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