Astronomy 2021A/B Lecture Notes - Exoplanet, Evaporation

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Colours of light: newton showed that white light is composed of all the colours of the rainbow, constituent colours of white light, when light gets reflected in water droplets it projects as a rainbow in the sky. Properties of waves: wavlength is the distance between two wave peaks, frequency is the nymber of times per second that a wave vibrates up and down, wave speed = wave length x frequency, particles of light are called photons. Atomic terminology: atomic number: number of protons in nucleus, atomic mass number: number of protons and neutrons, i. e. hydrogen atomic number 1 atomic mass number 1. All stars are made of gas: so when you use a spectrograph you can see what they are composed of, dark absorption lights , everything surrounded by a sheath of gas has an atmosphere not necessarily made up of the same things but still considered an atmosphere so the sun has an atmosphere (although it is mostly ionized)

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