Stars: Crash Course Astronomy #26
Stars: Crash Course Astronomy #26
Phil Plait’s Twitter account may be “badastronomer,” but he’s done a pretty good job of evaluating stars based on their spectra.
Key Ideas
As this video progresses, key ideas will be introduced to invoke discussion.
Key Ideas
Think about the following questions as you watch the video
- 00:39 What are two different reasons that stars appear to differ in brightness?
- 01:12 What is a spectrum?
- 01:32 What does it mean that a star gives off a continuous spectrum?
- 01:50 What does a star’s atmosphere do to its continuous wavelength?
- 02:25 What did Max Planck determine about bluer versus redder stars?
- 03:12 How does today’s star classification system arrange stars?
- 03:44 What letter classification is our Sun?
- 04:33 Why are there no green stars?
- 05:37 What is luminosity?
- 05:57 What two things does a star’s luminosity depend upon?
- 07:10 Describe the three groups of stars Hertzsprung and Russell saw when they plotted a chart of stars’ luminosity versus its temperature.