Dr. Phil Metzger Profile picture
Jul 18 17 tweets 5 min read Read on X
A little background. The earlier version of this mission was the Resource Prospector Mission. When Jim Bridenstine was appointed NASA Administrator, NASA cancelled it without his permission just hours before he was sworn in. I can’t confirm this, but rumors say he was livid! /1
2/ Mr. Bridenstine was appointed by Pres. Trump, and the Trump Transition Team had people assigned to plan space policy. They were calling people for input. I got one such call and the person told me they not only WEREN’T going to cancel Resource Prospector, but instead…
3/ …they were thinking about having MANY Resource Prospector missions. We talked about what would be the scientific, engineering, and economic value of building multiple copies of the mission. There was strong interest in the lunar ice to support building a sustainable program.
4/ Lunar ice and sustainable space exploration were major interests for Jim Bridenstine. When he was a Congressman from Oklahoma he had a blog where he talked about NASA supporting the development of the Cislunar Water Economy and how it was crucial for NASA’s future.
5/ I don’t recall the exact timeline now, so I don’t recall when I got that call from the Transition Team compared to when Mr. Bridenstine was sworn in, but from what I heard Jim was super pissed that they cancelled it without waiting just a few hours for him to take office.
6/ Surely he wouldn’t have approved its cancellation. You have to believe that the person in NASA who made that decision, whoever it was, *surely* knew they were playing dirty hardball politics, cancelling a program the incoming Admin loved just hours before he could stop them 😣
7/ But we were all promised, don’t worry, all the instruments that NASA built for the Resource Prospector Mission will be put onto future missions to the Moon.

Then later the VIPER mission was approved with the same Resource Prospector drill and instruments. YES! It was alive!
8/ Meanwhile, the lunar community held many studies and workshops on the lunar ice. Everybody agrees that a serious prospecting campaign is crucial, and VIPER is the best start. There is also geopolitical concern about nations competing over lunar resources. We believe it is…
9/ crucial for nations that support the international rules-based order to be leading in lunar exploration to influence and help establish fair and just policy. So it is vital for democratic nations to operate missions like VIPER as quickly as possible. Another couple years delay
10/ could be disproportionately harmful to the world’s future in space.

Lunar ice prospecting will also produce some of the most important science in *any* branch of science, bar none. Why?

We don’t know the story of how ice got on the Moon… Image
11/ but we think it might be related to a disruption of the Solar System that occurred some 3.8 billion years ago. The giant planets were slowed by gravitational friction of the Kuiper Belt, until Jupiter & Saturn got into resonance….

12/ This kicked Saturn outward, which kicked Neptune, possibly switching places with Uranus, so Neptune plunged into the Kuiper Belt, scattering small, icy bodies. Most scattered out, giving the modern Kuiper Belt its weird structural features, but a small fraction scattered in!
13/ These small bodies pummeled planets including the Moon in the inner Solar System. This is one of the possible sources of ice that we now see on the Moon. But over the billions of years, the ice has been reworked by impacts on the Moon so the record is doubtless confusing. 21stcentech.com/lunar-south-po…Image
14/ When we finally sort out the history of that ice, we will gain deep insights into the history of our Solar System including how water and carbon were delivered to the Earth, making it a life-supporting planet, and how often that happens elsewhere in the cosmos. Image
15/ So VIPER was going to be an important step towards answering the question “are we alone in the cosmos?” Not a trivial contribution to science! Image
16/ So now, if it is cancelled again, we will get several more years of delay or longer. This will be harmful to sustainability in space exploration, to geopolitical challenges in space, and to the most important science.

Congress needs to find the money to continue VIPER. Image
17/ I understand that projects get punished for going over budget by having the project cancelled. Consequences are important. But IMO, VIPER is too important and too urgent to be using its cancellation as a punishment.

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More from @DrPhiltill

Jun 22
Ok, here’s a little thread of some of the recent, awesome fluid dynamics content on here.

1. Checkout the computer modeling of airflow over an aircraft!

1/N
2. Vortices made visible by water vapor

/2
3. Just awesome! Look how the rings pull each other toward the end.
Read 14 tweets
Jun 12
Four other problems with landing on a flat pad, even if it is a steel with water deluge.

(I’m assuming the larger size of the Super Heavy booster is why they can’t use flat concrete like ordinary booster landings.)

The four problems: … /1
1/ You need enough surface area around the base of the rocket for the gas to flow out, or the engines will choke. Imagine a cylinder extended below the rocket to the ground. The exterior of that cylinder must exceed the exit area of all the rocket nozzles that are firing. Image
2/ With more engines firing you would need longer legs to keep that area large enough. If not, then the flow will choke meaning it goes subsonic and super high temperature and pressure, comparable to inside the combustion chamber, which can destroy the nozzles or engines.
Read 9 tweets
Jun 10
If I had to guess it would be this: same exact material as the existing tiles but just a wee bit thicker. Here is why…

1/N
2/ Here is what they look like on the inside. They are something like 98% empty space, and the rest is a glass fiber. The fibers touch each other along small contacts, so thermal conductivity is very low. (The scale bar is 100 microns, or 0.1 millimeter.)
Image
Image
3/ This is an extreme case of a “granular material” where the grains are long fibers. I did research on shuttle tiles when I worked in a physics lab at NASA, and I did research on thermal conductivity through granular materials, so I can report something interesting about this. Image
Read 14 tweets
Jun 4
This was the same reaction the science team had during the Apollo program — surprise that bone-dry soil could have so much cohesion! See the clods in the footpad image, especially. Short 🧵 1/N
2/ Closeup image of the clods. These are likely very porous, low density clods — very fluffy material — that will easily fall apart between your fingers. Yet they are in blocky shapes somehow held together as the footpad impacted and disrupted the ground. Image
3/ The first hint of this came from the famous boot print made by @TheRealBuzz. Scientists’ jaws dropped when they saw the clean, vertical sidewalls of this print in such dry, fluffy material! How could the sidewalls stand straight without any moisture?! Image
Read 18 tweets
Apr 28
Untrue. This does touch on something related that actually happened, which people have apparently distorted and used to prop up the dumb conspiracy theory. I will explain… 1/N
2/ First I’ll tell you what I know about the videos, then the telemetry.

When I analyzed the plume effects of the lunar landings, starting in the late 1990s and early 2000s, I tracked down the original data. One of the guys on my team worked with Houston to get the videos.
3/ The originals had been converted to digital and this was more convenient for us to use, since we wouldn’t need reel-to-reel NTSC video equipment, so this is what we got. I had high resolution copies of all the landing videos. There was no lost video. It all exists.
Read 15 tweets
Apr 18
NASA now building a flight-ready lunar excavator for a resource utilization pilot plant (not a demonstration — the actual pilot plant) on the Moon.
Discussing the challenges of reoeatably setting up the correct lunar soil conditions (compaction, rocks) for testing the lunar excavator on Earth. Image
3/ The robot will not be joystick-operated from Earth due to time delay and bandwidth limits. It will have software for autonomous mining & roving.
Read 8 tweets

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