Catalog Search Results
Publisher
Kanopy Streaming
Pub. Date
2014.
Physical Desc
1 online resource (1 video file, approximately 13 min.) : digital, .flv file, sound
Language
English
Description
Visible light, which can be seen with our eyes, comprises a small sliver of the electromagnetic spectrum. The rest of the spectrum, from short wavelength gamma rays to long-wavelength radio waves, requires special instruments to detect. ALMA uses and array of radio telescopes to detect and study radio waves from space. Radio telescopes are typically large parabolic dish antennas used singly or in an array. Radio observatories are preferentially located...
Publisher
The Great Courses
Pub. Date
2013.
Physical Desc
1 online resource (streaming video file) (30 minutes): digital, .flv file, sound
Language
English
Description
The Kepler mission is changing everything we know about extrasolar planets. Learn how this supersensitive-imaging instrument works to monitor 157,000 stars continuously for years and what it has uncovered since launching in 2009. But first, review the transit effect created when a parent star crosses its orbiting planet.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (33 minutes): digital, .flv file, sound
Language
English
Description
With an array of 66 radio antennas located in the high Chilean desert above much of the earth's atmosphere, the Atacama Large Millimeter/submillimeter Array (ALMA) is a radio telescope tuned to the higher frequencies of radio waves. Designed to examine some of the most distant and ancient galaxies ever seen, ALMA has not only revealed new stars in the making, but planetary systems as well.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (31 minutes): digital, .flv file, sound
Language
English
Description
In visible light, scientists had described galaxies as "island universes." But since the advent of radio astronomy, we've seen galaxies connected by streams of neutral hydrogen, interacting with and ripping the gasses from each other. Now astronomers have learned hat these strong environmental interactions are not a secondary feature - they are key to a galaxy's basic structure and appearance.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (33 minutes): digital, .flv file, sound
Language
English
Description
Interstellar clouds favor formation of carbon-based molecules over any other kind - not at all what statistical models predicted. In fact, interstellar clouds contain a profusion of chemicals similar to those that occur naturally on Earth. If planets are formed in this rich soup of organic molecules, is it possible life does not have to start from scratch on each planet?
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (29 minutes): digital, .flv file, sound
Language
English
Description
Take a tour of our neighboring planets via their radio emissions and learn how scientists infer their temperatures and energy sources. You'll be shocked by the difference between their images in reflected sunlight - the images we're familiar with - and their appearance when we "see" the radio energy they emit on their own.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (34 minutes): digital, .flv file, sound
Language
English
Description
Radio telescopes are so large because radio waves contain such a small amount of energy. For example, the signal from a standard cell phone measured one kilometer away is five million billion times stronger than the radio signals received from a bright quasar. Learn how each of these fascinating instruments is designed to meet a specific scientific goal.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (31 minutes): digital, .flv file, sound
Language
English
Description
A pulsar's spin begins with its birth in a supernova and can be altered by transfer of mass from a companion star. Learn how pulsars, these precise interstellar clocks, are used to confirm Einstein's prediction of gravitational waves by observations of a double-neutron-star system, and how we pull the pulsar signal out of the noise.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (717 minutes): digital, .flv file, sound
Language
English
Description
Taught by Professor Bradley Schaefer of Louisiana State University, this course shows how ancient Egyptians, Greeks, Indians, Chinese, and other cultures saw the sky. You learn how the Sun, Moon, and stars were their clock, calendar, and compass; constellations encoded their mythologies; and the heavens inspired religious and philosophical ideas, laying the foundation for modern science.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (31 minutes): digital, .flv file, sound
Language
English
Description
Learn how astronomers use very-long-baseline interferometry (VLBI) with telescopes thousands of miles apart to essentially create a radio telescope as big as the Earth. With VLBI, scientists not only look deep into galactic centers, study cosmic radio sources, and weigh black holes, but also more accurately tell time, study plate tectonics, and more - right here on planet Earth.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (29 minutes): digital, .flv file, sound
Language
English
Description
The Green Bank Observatory is located within the 13,000-acre National Radio Quiet Zone straddling the border of Virginia and West Virginia. Come tour this fascinating facility where astronomers discovered radiation belts around Jupiter, the black hole at the center of our galaxy, and the first known interstellar organic molecule, and began the search for extra-terrestrial life.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (32 minutes): digital, .flv file, sound
Language
English
Description
Using the laws of physics and electromagnetic radiation, astronomers can "weigh" a galaxy by studying the distribution of its rotating hydrogen. But when they do this, it soon becomes clear something is very wrong: A huge proportion of the galaxy's mass has simply gone missing. Welcome to the topsy-turvy world of dark matter - which we now believe accounts for 90 percent of our own Milky Way.
Publisher
The Great Courses
Pub. Date
2013.
Physical Desc
1 online resource (streaming video file) (32 minutes): digital, .flv file, sound
Language
English
Description
Space is so vast that inventing a method of faster-than-light travel is the only way humans could conceivably travel the cosmos conveniently. How hard is space travel, really? In this mind-bending lecture, review the obstacles to space travel and consider their theoretical solutions - from combining matter and antimatter into energy, to taking "short cuts" via warp drive and wormholes.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (30 minutes): digital, .flv file, sound
Language
English
Description
In the mid-1960s, astronomers discovered signals with predictable periodicity but no known source. In case these signals indicated extraterrestrial life, they were initially labeled LGM, Little Green Men. But research revealed the source of the pulsing radiation to be neutron stars.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (29 minutes): digital, .flv file, sound
Language
English
Description
In 1901, divers off a Greek island discovered a corroded bronze artifact composed of interlocking gears. Later analysis and X-ray imaging show it is an astonishingly versatile astronomical computer. Professor Schaefer identifies a probable date when it was built and two likely candidates for its brilliant designer.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (30 minutes): digital, .flv file, sound
Language
English
Description
When young engineer Karl Jansky was tasked to find natural radio sources that could interfere with commercial transatlantic radio communications, radio astronomy was born. His work led to the discovery of synchrotron radiation. But it would be decades before scientists understood what these earliest radio astronomers had detected - cosmic rays and magnetic fields.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (28 minutes): digital, .flv file, sound
Language
English
Description
Travel to Chaco Canyon, New Mexico, where the Anasazi culture practiced sky-centered rituals a thousand years ago. Look for evidence of their astronomical knowledge, examine their many "sun daggers," and probe the controversial pictograph thought to depict the Crab Nebula supernova explosion in 1054 AD.
Publisher
The Great Courses
Pub. Date
2013.
Physical Desc
1 online resource (streaming video file) (31 minutes): digital, .flv file, sound
Language
English
Description
Delve into the search for extraterrestrial life, or SETI, as the method used to gauge the likelihood of intelligent communicating civilizations is known. Look closely at the Drake Equation - the mathematical rubric commonly used in the field of SETI - and consider the challenge of communicating across our enormous galaxy.
Publisher
The Great Courses
Pub. Date
2017.
Physical Desc
1 online resource (streaming video file) (31 minutes): digital, .flv file, sound
Language
English
Description
Learn about techniques to separate signals originating in receivers from signals originating from outer space. Using a unique antenna located in New Jersey, we'll see how two radio astronomers with curiosity, persistence, and some manual labor, detected the faint radio signals from the big bang, the oldest electromagnetic radiation that can be detected.
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