Some points from lecture:
- Light is an electromagnetic wave.
- Light is emitted when an electron in an atom jumps to a lower energy state and emits a quantum of light.
- A system evolves in such a way as to maintain the lowest possible energy state.
- E = h * frequency, where E = energy, frequency is of the corresponding light
and h is Planck's constant.
- By looking at emitted light through a diffraction grating, we can see what elements are present.
- Most stars are made primarily of hydrogen (H) and helium (He). The proportions of most stars are 75% hydrogen
(by mass) and about 25% helium, with some traces of oxygen, silicon and other elements.
- Astronomical Timeline
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