AST101H1 Lecture Notes - Lecture 13: Kuiper Belt, Immanuel Kant, Planetesimal
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AST101H1 Full Course Notes
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Ast101- lecture 13: doppler"s shift, origi(cid:374) of the solar syste(cid:373) Light tells us: temperature: peak of continuum spectrum (blackbody curve, density: continuum spectrum vs line spectrum, composition: which emission/absorption lines are present. Has small effect as speed of a light wave is very fast. Clicker q&a: an orange object is moving towards you at a significant fraction of the speed of light. It will appear more blue (higher frequency and shorter wavelength) Doppler only measures line of sight: object moving directly away, measure all of its speed, moving across our line of sight, measure none of its speed, moving diagonally, measure only part of its speed. Real spectra are messy: spectrum of a galaxy has: Figure 2 (pearson education, 2014: emission and absorption lines from many elements, continuum spectrum from combined light of all the stars in the galaxy, all the lines are redshifted: