09 uni 06
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The document discusses Polaris, also known as the North Star. It explains that Polaris lines up almost perfectly with the Earth's axis over the north pole, which is why it does not appear to move in the night sky as the Earth rotates. The Earth's axis slowly changes alignment over many years in a process called precession, similar to the wobble of a top.
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09 uni 06
- 1. Polaris Polaris (the North Star) lines-up almost perfectly with the Earth's axis over the north pole. For this reason, it does not appear to move in the night sky as the Earth rotates.
- 2. Polaris Polaris (the North Star) lines-up almost perfectly with the Earth's axis over the north pole. For this reason, it does not appear to move in the night sky as the Earth rotates.
- 3. Precession Over many years the Earth's axis slowly changes alignment as it rotates and revolves. This "wobble" is called Precession (much like a top or dreidel).
- 4. Star Luminosity and Temperature
- 5. Hertzsprung-Russel Diagrams Stars are classified using 2 properties: Luminosity – Magnitude of brightness from dim to very bright. Directly related to size. Temperature – How hot the star is. Directly related to colour (blue is hottest, red is coolest).