It
was 20 years ago that astronomy, or perhaps even science itself, lost
the best friend it ever had when Carl Sagan died at age 62 from
complications of leukemia. For the better part of 2 decades, Sagan
was the face of astronomy and science itself, the first true
celebrity scientist since Albert Einstein. Now, 20 years later, the
young people who Sagan sought to inspire into careers in science
were, for the most part, not even born when Sagan was alive.
So,
who was Carl Sagan.
Sagan
is best known for his iconic Cosmos mini-series, which hit the
airwaves in 1980. While Cosmos propelled Sagan to international fame,
made him a household name, and the most recognized scientist in the
world, there was a lot more to the man than Cosmos.
Born
in Brooklyn in 1934, Sagan was interested in science from an early
age. Throughout his life, Sagan would recount two distinct episodes
that set him on his life's journey of discovery. The first was a
visit with his father to the 1939 World's Fair, which touted the
world of tomorrow as envisioned through advances science and
technology. The second event was a question (and its subsequent
answering by way of a local public library): what are the stars?
Though a 5 year-old Sagan did not know what science was, he was
fascinated by what he saw at the World's Fair and left with a sense
of wonder at the realization that the stars were Suns at a great
distance (and that the Sun was a star up close).
For
the rest of his life, Sagan would credit his parents, who were not
scientists and who actually understood very little science, for his
career thanks to their encouraging of his early curiosity as a child.
As an adult, Sagan would urge parents and adults across the nation
and around the world to do the same for their children, lamenting
that many potential scientists are put-off as children by adults'
discouragement.
Finishing
high school, whose science courses he recounted as being rather dull
and made of mindless memorization and experiments wherein the desired
solution was already known from the start, Sagan entered college,
eventually earning his Ph.D. in 1960.
For
Sagan, the timing couldn't have been better. 1960 was the dawning of
the space age and Sagan was right in the middle of it. Degree in hand
and scientific method in mind, Sagan quickly made a name for himself
as a research scientist, playing a key role in t he understanding of
the Venusian atmosphere and the planet that it shrouded. Long the
subject of wild speculation because of its hidden surface and
near-Earth size, Venus was, with a large credit to Sagan, finally
understood to be the world it is: a hell-in-space if you will with an
acidic atmosphere and a surface temperature hot enough to melt lead.
Following
his work on Venus, Sagan also took part in a variety of further
missions to Venus and other planets through the1970s, most notably
the Viking missions to Mars and the Voyagers to the
outer solar system. Additionally, Sagan became a consultant to NASA
and briefed many astronauts before their flights. In between, Sagan
wrote several well-received books that started to cement his
reputation not only as a scientist, but as an educator and a
spokesman for popular science itself.
Then
came Cosmos, for which Sagan put up a considerable sum of his
own money, worked constantly to secure donations for more, worked on
publicity, risked his job (Sagan was constantly away filming and not
teaching/researching at Ithaca University), and endured ridicule by
his peers (some felt Sagan was neglecting his university duties while
others considered popularizing science for the general public a waste
of time). Through it all, Sagan and his team persevered and Cosmos
finally hit the airwaves in August of 1980.
And
the rest, they say, is history.
His
fame cemented, Sagan would return to a more traditional role as an
academic teacher and researcher but would remain in the public eye as
the face of astronomy and science for the rest of his life through
appearances on TV, in documentaries, and through books. In the 1980s,
after his marriage to Ann Druyan (one of his Cosmos
co-writers), Sagan became increasingly outspoken on social issues,
championing causes including but not limited to: the environment,
education, world peace, and the teaching of the scientific method and
its applications not only to science, but to being an informed
consumer and citizen.
Throughout
the 1980s and 1990s, the awards rained down on Sagan for his
achievements in a wide variety of areas. The scientist had become a
renaissance man.
Sagan's
last book about astronomy, Pale Blue Dot, was published in
1994 and was inspired, in part, by a picture. After the 1989 Neptune
flyby, the mission was complete for the Voyagers, but then
Sagan had a big idea: why not turn the craft around and get a picture
of the entire solar system? This was done and all 8 planets were
captured in a single image, with Earth being a pale blue dot less
than a pixel in size suspended in a sunbeam. In the 1990s, Sagan's
activism, especially in the areas of protecting the environment and
ensuring world peace, continued. As Sagan noted himself, Earth is
tiny against the blackness of space and is, so far, the only place
where life is known to exist in the universe. That undisputed,
mankind has a duty to protect its only home but this is made more
difficult because humans now have the technology to end all life on
Earth through both environmental destruction and war, hence the need
for global awareness.
At
age 60, Sagan was diagnosed with a rare blood disorder, myodisplasia,
which commonly transforms into leukemia (as it did in Sagan's case).
For the remainder of his life, Sagan's health was in a precarious
state and was even saved by a bone marrow transplant. As 1996
progressed, Sagan's cancer returned and he once again endured another
round of chemotherapy. In his final interview just days before his
death, Sagan expressed optimism about not only his recovery but that of
the future in general.
Sadly,
his immune system depleted by the chemotherapy, Sagan shortly
thereafter contracted pneumonia, which took his life 20 years ago
today.
Yes,
while Carl Sagan has not been with us for 20 years now, his legacy
will endure so long as there are people on this Earth who are still
inspired by a sense of wonder to ask big questions when confronted
with the unknown, thus continuing the scientific journey of discovery
that Sagan so passionately encouraged.
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