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3) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: The Diverse Sizes of Stars
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English
Description
This lecture discusses the Hertzsprung-Russell diagram, a plot of stellar surface temperature versus luminosity that contains a wealth of information. Stars spend most of their existence on the diagram's well-defined main sequence; outliers include supergiants and white dwarfs.
4) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: The Corpses of Massive Stars
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Description
The imploding core of a Type II supernova typically forms a bizarre, enormously compact object called a neutron star, consisting entirely of tightly packed neutrons, a teaspoon of which would weigh about a billion tons.
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Why is the sky dark at night? In an infinitely old and large Universe the sky should be ablaze with light at all times. There are several possible answers to this paradox, each of which has profound cosmological implications. The relative youth of the Universe is now known to be the main explanation.
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Star clusters are gravitationally bound groups of stars that are all about the same age and the same distance from Earth. Astronomers can determine the approximate ages of clusters. This lecture also explains how the distance of extremely remote stars is found.
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Description
This lecture turns back the clock to almost the moment of creation-a fraction of a second after the Big Bang-and follows events as they sort themselves out, from what may have been packages of space-time foam winking in and out of existence, to conditions conducive for star and galaxy formation.
14) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Our Sun's Brilliant Future
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English
Description
As it gradually uses up the hydrogen in its core, fusing it to helium, the Sun will expand to form a red giant star. Through a series of relatively nonviolent eruptions, it will expel its outer layers of gas, producing a beautiful, glowing nebula around the dying core.
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