Audio
Recordings of Recent Non-technical Talks by Noted Astronomers |
Background: |
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Founded
in 1999, the Silicon Valley Astronomy Lectures are presented
on six Wednesday evenings during each school year at Foothill
College, in the heart of California's Silicon Valley.
Speakers over the years have included
Nobel-prize winners, members of the National Academy of Sciences,
the first woman in history to discover a planet, an astrophysicist
who is an award-winning science fiction writer, and many other
well-known scientists explaining astronomical developments
in everyday language. |
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The
series is moderated by Foothill's astronomy instructor Andrew
Fraknoi and sponsored by the Astronomical
Society of the Pacific, the SETI
Institute, NASA's
Ames Research Center, and the Foothill
College Astronomy Program. |
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If
you live in the San Francisco Bay Area, you can sign up to
receive advance e-mail notification of each lecture by clicking
here.
Thanks
to the creative work of DeAnza College Broadcast Media Production
Supervisor Marty Kahn, video versions of a few of the current
lectures can now be found at: http://www.deanza.edu/itunesu.
Once you launch iTunes, you will see the option of the Silicon
Valley Astronomy Lectures in the DeAnza iTunes library. |
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Lectures
Currently Available as Podcasts:
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Dr.
Jill Tarter (SETI Institute): "The Allen Telescope
Array: The Newest Pitchfork for Exploring the Cosmic Haystack"
April 23, 2008
Listen
(mp3 file, 12.3 MB)
Dr.
Tarter is the leader of the main project looking for radio
signals from alien civilizations (she was also the model for
the character Jodie Foster played in the movie "Contact.")
She updates us on the latest tools and plans in this quest,
as digital technologies make possible huge improvements in
our search systems. The Allen Telescope Array, being constructed
in Northern California, will be the most powerful tool for
finding SETI signals ever built. It is an innovative radio
telescope assembled from a large number of small dishes, using
consumer off-the-shelf technologies whenever possible to minimize
costs. In the next decade, this new instrument will enable
exploration that is 1000 to 10,000 times more sensitive than
in the previous decades. This may just be enough! |
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Dr.
Geoff Marcy (University of California, Berkeley): "New
Worlds and Yellowstone: How Common are Habitable Planets?"
March 5, 2008
Listen
(mp3 file, 10.5 MB)
Astronomers
have now discovered more than 250 planets orbiting other stars.
Hear the scientist who has discovered more planets than anyone
else in the history of the world discuss what kinds of planets
we have found so far, and what a new generation of telescopes
might find in the future. Could discoveries of planets that
resemble the Earth spark a new era when we could someday begin
communication with alien life? Dr. Marcy won the Shaw Prize
(one of the highest honors in science) in 2005 and was Discover
Magazine's Space Scientist of the Year. He and his co-workers
pioneered the technique for finding planets around other stars
without seeing light from the planet (by looking for wiggles
in the motion of the star each planet orbits.) |
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Dr.
Jeff Moore (NASA Ames Research Center): "New Horizons
at Jupiter (and Some Saturn News)"
Nov. 13, 2007
Listen
(mp3 file, 8.7 MB)
In
February, NASA's New Horizons spacecraft swung by the giant
planet Jupiter on its way to Pluto. Its instruments recorded
winderful images and other data about Jupiter's wild weather,
its ring, and its giant moons. Dr. Moore, who was Leader of
the Imaging Node for the encounter, shows the new photos of
the Jupiter system and discusses some of the discoveries made
by New Horizons. He also talks about one of the most exciting
discoveries of the Cassini mission around Saturn -- the new
understanding and exploration of water geysers on the moon
Enceladus. |
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Dr.
David Morrison (NASA Ames Research Center): "Taking
a Hit: Asteroid Impacts and Evolution"
October 3, 2007
Listen
(mp3 file, 9.4 MB)
Asteroids
have hit the Earth many time in the past, and they will continue
to hit in the future, whether we are prepared or not. Collisions
with our planet over 4.5 billion years have profoundly influenced
the evolution of life. (In fact, were it not for the impact
of a 15-km wide asteroid 65 million years ago, it is likely
humanity would not be here.) Dr. Morrison, one of the world's
experts on the study of asteroid impacts, discusses the past
and the future of these catastrophic hits, and explains how,
in the last two decades, we have learned (in principle) how
to defend ourselves. Unlike other natural hazards, we now
have the capability of removing most of the impact risk within
the next generation. However, the government still does not
have a plan of action for when an asteroid is discovered heading
our way or when an impact happens without any warning. (We
recommend you listen to this podcast holding hands with someone
you love.) |
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Dr.
Dana Backman (SETI Institute and Astronomical Society of
the Pacific): "A Ringside Seat to the Formation of
Planets"
May 23, 2007
Listen
(mp3 file, 9.9 MB)
Astronomers
have discovered dusty "doughnuts" of cosmic raw
material around many younger stars. In some cases, astronomers
can see tantalizing hints in the rings that planets may be
forming or may already have formed from this material. Dr.
Backman explains how new kinds of telescopes and observations
are making it possible for us to detect the birth process
of planets around nearby stars. He concludes by previewing
future observations of these intriguing dusty rings with upcoming
telescopes, particularly the SOFIA (Stratospheric Observatory
for Infrared Astronomy) Project in which NASA has outfitted
a 747 plane with a telescope that can observe heat-rays from
distant objects. |
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Dr.
David Grinspoon (Denver Museum of Nature and Science):
"Comparing Worlds: Climate Catastrophes in the Solar
System"
April 11, 2007
Listen
(mp3 file, 11.2 MB)
Take
an entertaining and enlightening journey with an astronomer
and popular author through the history of our solar system,
discovering runaway greenhouses and snowball planets. Compare
the evolution of Venus, Earth, and Mars over the years. And
learn how studying the evolution of other planets can help
us understand and predict climate change on Earth. |
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Dr.
Janice Voss (NASA Ames Research Center): "A Scientist
in Space" and "Searching for Earth-like Planets:
NASA's Kepler Mission"
March 7, 2007
Listen
(mp3 file, 8.7 MB)
Dr.
Voss, who has logged 49 days in space (traveling almost 19
million miles in 779 Earth orbits) discusses her work in space
and what it's like flying on the Shuttle as a scientist. She
then talks about NASA's upcoming Kepler mission, which will
use a telescope in space to search for "transits"
-- when a planet orbiting another star moves in front of its
star and blocks its light. Although a planet might only block
a tiny fraction of the light from a star, that decrease in
brightness is enough to give a clear signal that the planet
is there. With this mission, scientists hope to be able to
find not only Jupiter and Saturn-sized planets, but also those
as small as Earth. At the end, Dr. Voss answers a number of
audience questions about both aspects of her work. |
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Dr.
Bruce Margon (University of California, Santa Cruz):
"Glimpsing the Edge of the Universe: Results from the
Hubble Space Telescope"
January 24, 2007
Listen
(mp3 file, 12 MB)
The
Hubble Space Telescope has circled the Earth 15 times every
day for more than 16 years. Dr. Margon, who was until recently
the Associate Director for Science for the Hubble, describes
the most important discoveries made with the telescope and
how it can show us new details of the universe from the solar
system to the most distant reaches of space. In addition,
he briefly discusses the future of the Hubble and some interesting
public reactions to it. |
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Dr.
Dale Cruikshank (NASA Ames): "The Planet Pluto:
Maligned but Not Forgotten"
November 8, 2006
Listen
(mp3 file, 10.2 MB)
Dr.
Cruikshank reviews what we knew about Pluto (including its
atmosphere, of which he was the co-discoverer), why Pluto
was re-classified as a dwarf planet in the fall of 2006, and
what the New Horizons spacecraft may reveal about this distant
world in the next decade. |
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Dr.
Alex Filippenko (University of California, Berkeley):
"Dark Energy and the Runaway Universe"
October 4, 2006
Listen
(mp3 file, 12.5 MB)
In
1998, observations of very distant exploding stars provided
intriguing evidence that the expansion of the Universe is
speeding up with time, rather than slowing down due to gravity
as expected. Today, new and completely independent observations
strongly support this amazing conclusion. Over the largest
scales of space, our Universe seems to be dominated by a repulsive
"dark energy," stretching the very fabric of space
itself. Dr. Filippenko, who is a leader in the group that
has made some of these remarkable observations, gives us a
progress report on our "runaway universe" and then
answers a host of audience questions about the overall behavior
of the universe. |
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Dr.
Nathalie Cabrol (SETI Institute): "The Mars Exploration
Rover Mission: A Year of Exploration and Discovery"
May 19, 2005
Listen
(mp3 file, 9.1 MB)
Dr.
Nathalie Cabrol is a planetary geologist who is a member of
the Science Team for the Mars Exploration Rover mission. She
specializes in exploring regions of Earth that resemble Mars
(including Licancabur, the highest lake on our planet). She
was instrumental in the selection of one of the landing sites
for the Mars rovers and is busily analyzing images and data
from the mission. In this 2005 lecture, she gave an early
progress report on the work of the Spirit and Opportunity
rovers, and some of their discoveries about the red planet. |
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Dr.
Frank Drake (SETI Institute, University of California,
Santa Cruz): "Estimating the Chances of Life Out
There"
April 20, 2005
Listen
(mp3 file, 8.4 MB)
In
1961, Dr. Drake proposed an intriguing method of estimating
the number of intelligent life-forms out there that we might
communicate with, now called the Drake Equation. In this talk,
Dr. Drake provides a modern update on estimates for the existence
of "E.T." He draws on new ideas and new observations
(including the discovery of surprising planets around other
stars), which have helped astronomers refine both the targets
where they search for life and the methods they use. |
The
Recordings:
Although
as many as a thousand people have attended each lecture, we believe
that the potential audience for these popular-level talks is far
greater. Thus we are beginning an experiment to record the audio
portion of each program and make it available on the Web, with the
kind permission of the speakers. (We would like to thank Palo Alto
audio-visual engineer Douglas Bassler for his help in recording
the lectures and Perry Thorwaldson of Thor Audio Solutions for the
use of recording equipment.) We are also recording the lectures
in video (as funds become available).
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