House Science Committee Hearing Charter: Lunar Science & Resources: Future Options
Thursday, April 1, 2004
1:00 p.m.
2318 Rayburn House Office Building
1. Purpose
On Thursday, April 1, 2004 at 1:00 p.m., the Subcommittee on Space and Aeronautics
will hold a hearing to examine current thinking about the suitability of the Moon for
scientific and commercial activities.
The hearing is not meant to focus on whether to go to the Moon, but rather is intended to
examine the suitability of using the Moon for an extended – perhaps permanent –
presence to conduct space science and resource-extraction activities.
2. Witnesses
- Dr. Paul Spudis is a Senior Staff Scientist at the Johns Hopkins University Applied Physics Laboratory and Visiting Scientist at the Lunar and Planetary Institute in Houston, Texas.
- Dr. Daniel F. Lester is a Research Scientist at the McDonald Observatory, University of Texas at Austin.
- Dr. Donald Campbell is a Professor of Astronomy and associate director of the National Astronomy and Ionosphere Center (NAIC) at Cornell University.
- Dr. John S. Lewis is a Professor of Planetary Sciences and Co-Director of the Space Engineering Research Center at the University of Arizona.
- Dr. Timothy Swindle is Professor of Geosciences and Planetary Sciences at the University of Arizona.
3. Overarching Questions
1. Is the Moon a uniquely useful site to base deep-space radio, infrared and optical
telescopes or other science instruments?
a. Can space science be conducted using instruments on the Moon more
reliably and cheaply than it could be done from earth or using satellite-
based instruments? What other fields of science (i.e., astrobiology,
cosmology) would benefit from using a Moon-based laboratory?
2. Does the Moon contain minerals, isotopes, or other materials that one day may be
commercially exploitable? How much certainty is there about the presence and
quantity of these resources? How readily extractable are they?
a. What additional technologies, if any, must we first develop before these
resources can be made useful?
4. Background
On January 14, 2004, President Bush announced his Space Exploration Initiative, putting
in motion a major new NASA program to send astronauts to the “Moon, Mars and
beyond.” Among other goals, the plan states: “The extended human presence on the
Moon will enable astronauts to develop new technologies and harness the Moon’s
abundant resources to allow manned exploration of the challenging environments…
Experience and knowledge gained on the Moon will serve as a foundation for human
missions beyond the Moon, beginning with Mars.”1
The Space Exploration Initiative calls for the first launch of a robotic probe to the Moon
in 2008 to begin mapping and reconnaissance studies. At least one probe will be
launched each year thereafter, either an orbiter or lander, with the goal that the first
manned Moon mission would occur between 2015 and 2020. While the Space
Exploration Initiative establishes a goal of going back to the Moon, it does not specify
what we would do once we get there (i.e., lunar geology, space telescopes, mining).
The initiative is silent on whether the U.S. would attempt to establish a permanent human
presence on the Moon. But proponents of such a presence believe the time is ripe to
advocate lunar bases – robotic or human tended – as a logical next step of any U.S. effort
to return to the Moon.
Some members of the lunar science and astronomy communities have long viewed the
Moon as a base from which to operate telescopes and other science instruments.
The Moon offers several clear advantages – and disadvantages – as a base for
astronomical observatories. Advantages include the lack of an atmosphere, its ability to
shield instruments from radio and thermal pollution of Earth, lack of a magnetic field, a
solid surface, and, in lunar craters at the poles, the capability of keeping infra-red
telescopes operating at optimally cold temperatures.
Disadvantages include dust, the need to install power sources to run instruments, and the
risk of landing payloads safely on the Moon. Human-tended operations pose challenges
that are far greater, such as assuring a reliable supply of food, water and oxygen;
developing a suitable shelter; high background radiation; the risks of launching and
landing; working in a cold vacuum; and the prolonged effects of operating in a low-
gravity (one-sixth of Earth’s) environment.
1 “President Bush Announces New Vision for Space Exploration Program.”
www.whitehouse.gov/news/releases/2004/01/20040114-1.html
Some scientists believe the Moon contains large deposits of minerals and isotopes that
one day may be commercially exploitable. Of most interest is the possible presence of
water, and the presenceHelium-3, which theoretically could be used on Earth to generate
energy using fusion reactors.
The attached article from the March 12, 2004 edition of Science Magazine outlines the
debate on possible activities that could be conducted on the Moon.
5. Issues
1994, the U.S. lunar orbiter Clementine found indications of frozen water at the
Moon’s poles. Scientists disagree on whether water is actually present, and, if it
is, whether it exists in significant quantities. Obviously, water would be a boon to
any human activities on the moon because it could be used to sustain human life
and to produce hydrogen fuel and oxygen. If no readily accessible source of
water is found, lunar astronauts would need to transport their own water,
significantly adding to the logistics burden and possibly limiting the amount of
other materials they could bring along, as well as limiting the time they could
remain on the Moon.
Water can be transformed into fuel (hydrogen) and oxygen, but exploiting this
opportunity requires launching heavy processing equipment from Earth, safely
landing and assembling it on the lunar surface, and providing power for its
operation. Would benefits of this approach outweigh the costs of simply
launching fuel and oxygen from Earth? Would the lack of easily extractable lunar
ice prove to be an insurmountable obstacle to long-term human habitation?
for astronomical observatories? How does the Moon compare with other
alternatives? Scientists disagree about the benefits of using the Moon as a site
for operating science instruments that are designed to look into deep space.
Astronomical observatories located on the Moon’s far side, or at its poles, hold
many advantages over Earth-based observatories. Having no atmosphere
eliminates a major source of aberrations common to Earth-based telescopes and it
permits viewing objects at all wavelengths (Earth’s atmosphere filters out
ultraviolet, x-ray, and gamma ray wavelengths). The Moon would also act as a
shield against radio and thermal pollution from Earth sources. Its uniformly low
temperatures at the lunar poles provide an excellent location to site infra-red
telescopes.
Disadvantages include the threat of lunar dust settling on, and obstructing
telescope optics. Dust may be kicked up during landing, assembly, or repair. The
risk of safely landing the telescope is substantial. Providing power to run the
instruments will require construction of solar arrays or the use of a small nuclear-
electric generator at a location far enough away to avoid interference. Relying on lunar astronauts to assemble the observatory raises significant risk factors,
especially if they are expected to work at the bottom of a deep, cold crater.
Some scientists advocate free-flying telescopes (such as Hubble, the Chandra
Observatory, and the newly commissioned Spitzer Infra-red Observatory) as a
more cost-effective, less risky alternative than lunar-based telescopes. With the
exception of Hubble, none of the observatories are designed to be serviced or
repaired, eliminating any need for human tending. Free flyers can be launched to
high Earth orbits or libration points, removing a large source of thermal and radio
interference. Guidance, pointing and tracking technologies are extremely
accurate, negating any advantage of using a stable lunar surface.
Scientists disagree about the amounts and types of valuable ores that may be
found on the Moon. A related issue is whether commercial enterprises can
overcome the huge costs associated with launching, landing and assembling
foundries and fabrication facilities to mine and process any ores, and transport
finished products to Earth or use them to support missions to other parts of the
Solar System. Once again, the availability of lunar ice (water) would affect the
success of such activities.
Harvesting resources on the Moon would also raise several important legal
questions (about which the Committee intends to hold a future hearing). The
United States is a signatory to four multinational treaties concerning the use of
outer space, two of which expressly mention the Moon. The Treaty on Principles
Governing the Activities of States in the Exploration of the Use of Outer Space,
including the Moon and Other Celestial Bodies was codified in 1967 and ratified
by the United States, Russia and 96 other nations. Among other things, the treaty
provides that the Moon is “not subject to national appropriation.” The United
States is not a signatory to the Agreement Governing the Activities of States on
the Moon and Other Celestial Bodies (“the Moon Treaty”). Codified in 1979 and
ratified by only seven nations, the Moon Treaty states in relevant part that the
Moon is “the common heritage of all mankind,” and that the moon’s natural
resources may not become the property of any person. The treaty further provides
for an international regime to govern the “exploitation of the natural resources of
the Moon.”
How practical is it to consider extracting Helium-3 for power generation
facilities on Earth? Helium-3 is a scarce isotope on Earth but lunar samples
returned by Apollo missions suggests that it is more abundant on the Moon’s
surface. While it may more plentiful, extracting large amounts of Helium-3 from
lunar soil is likely to prove difficult. Physicists believe Helium-3 will one day be
used as a fuel for specially designed fusion reactors on Earth, but development of
such reactors is decades away.
6. Questions to Witnesses
In his letter of invitation to appear as a witness, Dr. Spudis was asked to address the
following questions in his testimony:
- What science can be conducted on the surface of the Moon that cannot be duplicated by Earth-based research or free-flying satellites?
- What minerals, elements and isotopes exist on the Moon in sufficient quantities that they could contribute to expanding the reach of human exploration of the solar system? What is the basis of your estimate and how widely shared is it? How soon after a human return to the Moon would it be possible to begin exploiting resources?
- How much water do you believe is trapped on the Lunar surface, and what is the basis of your estimates? How confident are you of these estimates? Based on current observations, is the water concentrated in various pockets on the Lunar surface, or is it widely distributed?
- Do you believe that long-term human habitation on the Moon is necessary to conduct science and lunar resource extraction activities? What role would robotics play?
In his letter of invitation to appear as a witness, Dr. Lewis was asked to address the
following questions in his testimony:
- What minerals, elements and isotopes exist on the Moon in sufficient quantities that they could contribute to expanding the reach of human exploration of the solar system? What is the basis of your estimate and how widely shared is it? How soon after a human return to the Moon would it be possible to begin exploiting resources?
- What are the advantages to human exploration of the solar system by siting fabrication and processing facilities on the Moon? Can Lunar-based fabrication be done more effectively than using Earth-bound facilities?
- How would you characterize the possibility that extraction of Moon materials may one day be commercially viable ?
In his letter of invitation to appear as a witness, Dr. Campbell was asked to address the
following questions in his testimony:
- How much water do you believe is trapped on the Lunar surface, and what is the basis of your estimates? How confident are you of these estimates? Based on current observations, is the water concentrated in various pockets on the Lunar surface, or is it widely distributed?
- How important is finding water to exploiting the Moon for scientific or economic purposes?
- What kinds of instruments need to be flown on upcoming Lunar probes to try to resolve questions about water on the Moon?
- What other minerals, ores, or elements do you believe may be present in the lunar soil that may hold interest for future exploitation?
In his letter of invitation to appear as a witness, Dr. Lester was asked to address the
following questions in his testimony:
- What space science can be conducted on the surface of the Moon that cannot be duplicated by Earth-based research or free-flying satellites?
- Is the Moon an appropriate site for astronomical observatories? What advantages and disadvantages does the Moon pose as a base for telescopes?
- As NASA begins to launch lunar robotic probes to survey the Moon’s resources, what instruments should be flown on the probes that can be used to serve the Space Exploration Initiative as well as inform lunar scientists about the suitability of using the Moon as a base for long-term science activities?
- What are your views about the practicality of establishing long-term human bases on the Moon to conduct science? Will robotics be able to carryout the same science missions without the presence of humans on the Moon?
In his letter of invitation to appear as a witness, Dr. Swindle was asked to address the
following questions in his testimony:
- What are the most pressing questions in lunar science? To what extent do they require human lunar missions to be pursued? To what extent can they be pursued from Earth?
- What minerals, elements and isotopes exist on the Moon in sufficient quantities that they could contribute to expanding the reach of human exploration of the solar system? What is the basis of your estimate and how widely shared is it? How soon after a human return to the Moon would it be possible to begin exploiting resources?
- Specifically, how much Helium-3 do you believe is on the Moon, and what is the basis of your estimate? Based on current observations, is the Helium-3 concentrated in various pockets on the Lunar surface, or is it widely distributed? How much ore would have to processed to refine useful amounts of Helium-3, and how technologically difficult would it be to accomplish? How long after a human return to the moon would production of Helium-3 likely be viable? How close are we to developing technologies that could make use of Helium-3?
7. Attachment
“Moon’s ‘Abundant Resources’ Largely an Unknown Quantity”, Science Magazine,
March 12, 2004
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