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Exploration, Discovery and Science
Editor's Note: This is the 11th in a series of essays
on exploration by Steven J. Dick.
The terms
"exploration" and "discovery" have been headlined since President George W. Bush
announced new goals for NASA and the nation in January 2004.
The new
space exploration policy laid out that day to go to the Moon, Mars and beyond
was entitled "A
Renewed Spirit of Discovery." It was followed in February by a more detailed
"Vision
for Space Exploration," pointing out the importance of exploration and
discovery to the American experience, in the tradition of Lewis and Clark. By
June a nine-member Presidential Commission on Implementation of United States
Space Exploration Policy had produced a report on "A Journey to
Inspire, Innovate, and Discover." In February 2005 NASA's strategic
objectives were released in a report called "The New Age of
Exploration."
 Image above: One of
the first images of Mars returned by the Spirit rover in January 2004. Photo
credit: NASA/JPL/Cornell.
The renewed emphasis on exploration at
NASA raises the question of the relation between exploration, discovery and
science - and not just for academic reasons. One formulation holds that
exploration and science are one and the same, and that when it comes to
spaceflight, exploration equals science. A recent National Research Council
study, Science in NASA's Vision for Space Exploration, asserted that
"Exploration is a key step in the search for fundamental and systematic
understanding of the universe around us. Exploration done properly is a form of
science."
Yet, while it is clear that there is a synergy between
exploration and science, as historian Roger Launius argued at a recent meeting
on "Critical Issues in the History of Spaceflight," I would argue they are not
one and the same. After all Magellan was an explorer, not a scientist or a
natural philosopher.
Many scientists undertake routine science that can
hardly be called exploration. Adding another decimal point to the positional
precision of a star or planet is hardly exploration, even if it can occasionally
illuminate anomalies (such as the 43 seconds of arc discrepancy in the advance
of the perihelion of Mercury, later explained by Einstein's theory of
relativity.)
Thus, even routine science can lead to discovery, but often
it does not. Exploration can also lead to discovery, but not necessarily. In
either case, exploration and science are not the same.
Another approach
to understanding this relationship is that exploration is undertaken, sometimes
leading to discoveries, which then are explained by science and in turn add to
our body of scientific knowledge. This seems to me a more robust formulation,
leaving open the idea that exploration and science are not coextensive. MIT
physicist Philip Morrison, a pioneer in the Search for Extraterrestrial
Intelligence (SETI) who died last month at the age of 89, answered critics who
said that such a search was not science by explaining that "unlike science, this
topic extends beyond the test of a well-framed hypothesis . that has a proud
name in the history of thought as well; it is called exploration." Exploration
can be more open-ended than science, holding the possibility of discoveries
totally unexpected - or no discoveries at all.
| Even though science may be a motivation for
exploration and a product of it, human exploration is more than the sum of
all science ... it is individually a primordial human urge, and in a
larger sense the mark of a creative society.
| These distinctions become an issue of
public policy when decisions must be made about the balance between human and
robotic exploration. Critics of human space exploration, including space science
pioneers like James van Allen, point out that robotic spacecraft are generally
much cheaper and generate more science. This controversy has a long history in
the space program, and in NASA in particular. The Apollo program, generally
considered NASA's greatest triumph, was nevertheless criticized for generating
little science relative to its high cost. The only scientist among the 12
astronauts who walked on the Moon was geologist Harrison Schmitt on Apollo 17,
the program's last flight in 1972. Yet, Apollo represented something beyond
science, and will forever be remembered as one of humanity's greatest triumphs,
precisely because it was in the long tradition of human exploration.
To
be sure, in the past human spaceflight has been deeply bound up with national
prestige. And it remains so today, with the Chinese entering the arena. Yet,
those ventures were, and still are, couched in the language of exploration, a
significant motivator in itself. Many space scientists have come to this
realization.
At a recent NASA meeting on Risk and Exploration, Steve
Squyres, the science principal investigator for the Mars Exploration Rovers,
allowed how he loved his machines, which are still active after 16 months. But,
he added, "when I hear people point to Spirit and Opportunity and say that these
are examples of why we don't need to send humans to Mars, I get very upset.
Because that's not even the right discussion to be having. We must send humans
to Mars. We can't do it soon enough for me."
Squyres reflects a deep
truth: even though science may be a motivation for exploration and a product of
it, human exploration is more than the sum of all science. As I have argued in
past essays, it is individually a primordial human urge, and in a larger sense
the mark of a creative society.
The New Age of Exploration speaks
of a human and robotic partnership for exploration - robotic reconnaissance,
followed by human voyages that satisfy that desire to explore in person and up
close. In the end the National Research Council study also concluded that "the
expansion of the frontiers of human spaceflight and the robotic study of the
broader universe can be complementary approaches to a larger goal." To achieve
that balanced partnership with the limited resources at hand, in the midst of
turbulent events on Earth, is the challenge now before NASA.
Further Reading: Dick, Steven J. and Keith Cowing (eds.), Risk and
Exploration: Earth, Sea and the Stars (NASA SP 2005-4710) (forthcoming
August 2005)
Dick, Steven J. and Roger Launius (eds). Critical Issues
in the History of Spaceflight (in press).
NASA, The New Age of
Exploration: NASA's Direction for 2005 and Beyond (NP-2005-01-397-HQ; online
at http://www.nasa.gov/pdf/107490main_FY06_Direction.pdf.
National
Research Council, Science in NASA's Vision for Space Exploration (2005);
online at http://www.house.gov/science/hot/Hubble/NASVisionSpace.pdf
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