David Wittman
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Star Laws Episode I: The HR Plot
drdwittman
697 views
Just a few simple laws of physics allow us to figure out a lot about stars. This is a summary of most of what you need to know for the first midterm.
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Abundances of the Elements: We Are Made of Star Stuff
drdwittman
403 views
Models of nuclear fusion in the cores of stars predict the abundances of the elements, for example how common carbon and oxygen should be and how uncommon fluorine and arse...
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General Relativity: The Equivalence Principle
drdwittman
2,323 views
The equivalence principle is key to understanding that light is deflected by gravity, and to understanding gravitational redshift.
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General Relativity: Gravity makes time run slowly
drdwittman
1,267 views
Conceptual understanding of why gravity makes clocks run slowly.
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Special Relativity: Length contraction in more detail
drdwittman
4,261 views
A sequel to my time dilation and length contraction video: more detail on length contraction.
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Special relativity: time dilation and length contraction
drdwittman
17,552 views
An easy way to understand why time dilation and length contraction occur at speeds near the speed of light.
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Spectral Lines Demo
drdwittman
9,291 views
A look at spectral lines from different elements and molecules, and from a thermal emitter.
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Distances and Sizes in Astronomy, episode 3
drdwittman
582 views
Distances to nearby stars (other than the Sun), using parallax.
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Distances and Sizes in Astronomy, episode 2
drdwittman
464 views
Episode 2 covers distances to the Sun and other solar system objects, and size of the Sun, with an absolute minimum of math.
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Distances and Sizes in Astronomy, episode 1
drdwittman
853 views
First in a series for students in my nonmathematical introductory astronomy course. This one covers the general relation between distance and size, and then the specific c...
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