Difference between revisions of "Show Stoppers"
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{| | {| | ||
| − | On the Earth: || Celsius || Kelvin || Fahrenheit | + | | '''On the Earth''': || Celsius || Kelvin || || Fahrenheit |
|- | |- | ||
| − | Human Body || 37 C || 310 K || 98.6 F | + | | Human Body || 37 C || 310 K || || 98.6 F |
|- | |- | ||
| − | Room Temperature || 22 C || 295 K || 72 F | + | | Room Temperature || 22 C || 295 K || || 72 F |
|- | |- | ||
| − | Hot living on Earth || 50 C || 322 K || 120 F | + | | Hot living on Earth || 50 C || 322 K || || 120 F |
|- | |- | ||
| − | Boil an egg || 100 C || 373 K || 212 F | + | | Boil an egg || 100 C || 373 K || || 212 F |
|- | |- | ||
| − | Afternoon on the Moon at the Equator: || || || | + | | '''Afternoon on the Moon at the Equator:''' || || || || |
|- | |- | ||
| − | Mean || 107 C || 380 K || 225 F | + | | Mean || 107 C || 380 K || || 225 F |
|- | |- | ||
| − | Maximum || 127 C || 400 K || 260 F | + | | Maximum || 127 C || 400 K || || 260 F |
|- | |- | ||
| − | Daytime on the Moon at the Poles: || || || | + | | '''Daytime on the Moon at the Poles:''' || || || || |
|- | |- | ||
| − | Mean || 0 C || 272 K || 32 F | + | | Mean || 0 C || 272 K || || 32 F |
|} | |} | ||
Revision as of 03:06, 21 April 2007
This article is a topic of debate. |
Show Stoppers
Major problems that can stop our whole effort
Show Stoppers are problems that we currently have no plan for addressing, yet we cannot do some major part of returning to the Moon until these very problems are solved.
Often there will be a long list of pros and cons for a technical idea, yet one small, insignificant problem blocks all progress. All the other problems then become nothing but smoke and red herrings.
Spotting and solving Show Stoppers is one of the great skills of technical for a technical person that approaches being a Zen master.
The following Show Stoppers are blocking our way to the Moon. Can you come up with viable solutions?
The Interest of the American Public is Missing
The American people are not showing any interest in returning to the Moon.
What is at risk:
The entire program is at risk of being dropped, again. Funding will dry up completely.
Technical Details of the Problem:
The idea of returning to the Moon was put forward by President George W. Bush, but did not catch on. It was subsequently driven from the public stage by the War in Iraq and Global Climate Change. Funding for NASA has been cut.
We will need to keep the return to the Moon idea alive even while moving substantial amounts of our space resources back to Earth science to develop the data needed to understand and address the Global Climate Change problem.
Available Actions:
On Lunarpedia the Purposes List provides a wide selection of ideas on possible action. Some look at what needs to be done and some look at how to do it.
Afternoon Temperatures at the Equator
The afternoon surface temperatures at the Lunar Equator are so high that it is very difficult to maintain human life support and protect critical equipment.
What is at risk:
No lunar site near the Equator can be visited for more than a few days until this problem is addressed. A permanent settlement in any of these promising locations is currently impossible. This, and only this, has driven us to the poles.
Technical Details of the Problem:
Maintaining living space temperatures for the crew is one of the most important parts of life support. Also designing equipment, such as your return vehicle, to withstand high temperatures is difficult and expensive. High surface temperatures create a significant risk to both crew and mission.
In space the only way to dump waste heat is to radiate it to deep space. Specialized thermal radiator panels are used and must have a wide view of space. If these panels also see a wide expanse of hot lunar surface, they will work very poorly.
The temperature of lunar surface in the afternoon at the Equator can be above 100 C for more than 100 hours. Some key temperatures include:
| On the Earth: | Celsius | Kelvin | Fahrenheit | |
| Human Body | 37 C | 310 K | 98.6 F | |
| Room Temperature | 22 C | 295 K | 72 F | |
| Hot living on Earth | 50 C | 322 K | 120 F | |
| Boil an egg | 100 C | 373 K | 212 F | |
| Afternoon on the Moon at the Equator: | ||||
| Mean | 107 C | 380 K | 225 F | |
| Maximum | 127 C | 400 K | 260 F | |
| Daytime on the Moon at the Poles: | ||||
| Mean | 0 C | 272 K | 32 F |
Very little equipment can stand this much heat directly. Normal space suits would keep you alive only a limited time.
Available Actions:
This is the primary reason that sites for the first lunar station are only being considered at the poles. This one problem trumps everything else.
Life support could be maintained with a complex double cycle refrigeration system. These systems are complex and require significant mass shipped from Earth. The reliability of these systems is also under question.
In the long run, living space can be covered with Lunar Regolith as described in Architecture as Mole Hills. This both stabilizes the temperature and provides radiation protection.
Some form of umbrella or tent is possible for outside equipment, such as your return spacecraft. Again this bring up safety issues.
In the long run, partially buried hangers for outside equipment and robots are also possible.
If you favor an equatorial site for the first lunar settlement, solve this problem.
