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Dr. Bidushi Bhattacharya explains how astronomers find tiny space rocks. Since asteroids don't move in a predictable orbit, astronomers must take a series of photographs to track the asteroids. Part of the "Ask an Astronomer" series.
(Source: DCMP)
In this episode, scientist Steve Lord discusses the findings of astronomer Edmond Halley, and his discoveries related to the movement of stars. Halley used ancient Greek records to prove that stars move as they orbit within their galaxies. Part of the "Ask an Astronomer" series.
Dr. Varoujan Gorjian discusses the ways galaxies might die. They could collide with one another, and sometime they run out of energy. Part of the "Ask an Astronomer" series.
In this episode, Dr. Michelle Thaller explains the molecular makeup of space. She discusses "interstellar medium," which is what is found between stars. Part of the "Ask an Astronomer" series.
In this episode, scientists discuss the W5 star-forming region. Through the use of infrared light, they show areas within the region where new stars are being formed. Part of the "Ask an Astronomer" series.
In this episode, Dr. Varoujan Gorjian discusses what happens when galaxies collide. Usually new stars form due to the impact of gases on one another. Part of the "Ask an Astronomer" series.
There isn't an easy answer to the question: What is the nearest galaxy to the Milky Way? The Andromeda Galaxy is the closest complete galaxy; however, astronomers have found several dwarf galaxies orbiting the Milky Way. Part of the "Ask an Astronomer" series.
In this episode, Dr. Carolyn Brinkworth explains why the sky is blue. She also discusses what the color of the sky has to do with finding life on distant planets. Part of the "Ask an Astronomer" series.
Dr. Carolyn Brinkworth addresses a famous science fiction scenario in this episode. She discusses the three requirements for planets to form around binary stars. Part of the "Ask an Astronomer" series.
Dr. Michelle Thaller explains the relationship between visible light and the principle of black-body radiation. These two aspects along with the anatomy of the human eye explain why stars don't appear green in the night sky. Part of the "Ask an Astronomer" series.
Dr. Michelle Thaller explains infrared light. Due to its longer wavelengths than those of visible light, infrared light is invisible to the human eye. However, special equipment exists that makes these wavelengths visible. Part of the "Ask an Astronomer" series.
In this animated special, the alien M51 moves the Earth into a closer orbit around the sun. This has some serious consequences for all living things. M51 learns important lessons about life in the universe. Part of the "Ask an Astronomer" series.
In this episode, Dr. Varoujan Gorjian explains the mind-boggling expansion of the universe. He uses a balloon to demonstrate how space is expanding. Part of the "Ask an Astronomer" series.
In this episode, scientist Steve Lord explains the relationship between gravity and the shape of galaxies. Gravitational forces from the galaxy's core causes all the stars to rotate. This rotation causes spiral waves. Part of the "Ask an Astronomer" series.
With support from the National Science Foundation, astronomers Marc Buie and John Keller are involving citizen scientists from throughout the western United States to participate in the Research and Education Cooperative Occultation Network (RECON). The project has provided telescope equipment and training to 14 small western U.S. communities north and south of Reno, Nevada, where night skies are clear and dark. When RECON students look out at the night sky, they look way out to the Kuiper Belt, a ring of icy debris that litters the Solar System out beyond Neptune. The network is looking to determine the sizes of Kuiper Belt objects as they pass in front of distant stars. Part of the National Science Foundation Series “Science Nation.”
At first glance, the bone-dry landscape of the Atacama Desert in Chile might seem inhospitable. But, it’s prime real estate for astronomers. This desert is now home to the largest ground-based radio telescope in the world called the Atacama Large Millimeter/submillimeter Array or “ALMA for short. And, it’s allowing astronomers to see the universe like never before. Part of the National Science Foundation Series "Science Nation."
Astronomers are beginning to locate thousands of planets that exist outside of the solar system. Scientists provide a behind-the-scenes look at the simple technique that astronomers are using to discover these curious new planets. Part of the "Science Out Loud" series.
Actors portray prominent scientists and astronomers as they present the history of astronomy from Plato to Newton in its historical and cultural contexts. The Greeks reasoned that the universe was geocentric--the earth was at its center. Not until Copernicus did the theory of the sun as center take root. Each major astronomer declares his different theory until Newton's answers all questions about gravitational pull between planets.
What is a black hole? Hans Krimm, an observational astronomer at the National Science Foundation, answers this question. Part of the "Ask a Scientist" series.
Discover how the James Webb Space Telescope will help scientists studying the formation of stars. The telescope will provide infrared observations and give astronomers an unprecedented view of stellar birth. Computer models show how a giant cloud of gas and dust collapses to form stars and planets.
