AST201H1 Lecture Notes - Niels Bohr

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Published on 20 Apr 2013
School
Course
Professor
January'8,'2013'
Lecture'1:'Introduction'and'The'Great'Mysteries'of'Modern'Cosmology:'Dark'
Matter'and'Dark'Energy'
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Hubble'eXtreme'Deep'Field'on'the'Sky'
The'size'of'universe'is'enormous''
The'light'we'see'is'not'the'current'light,'it'has'travelled'some'distance'to'
reach'Earth'
o Some'of'the'galaxies'are'the'first'galaxies'that'have'ever'formed'in'the'
universe,'whose'light'has'just'reached'us''
o The'distance'that'light'has'travelled'is'in'the'unit'of'light'year'
Contents'of'the'Universe''
Previous'Theory:'Mostly'contained'Stars,'gas,'galaxies,'planets,'dust','etc.'
o However,'90%'of'the'masses'are'missing'
! Either'what'we'know'about'gravity'is'missing'
! Or'there'are'other'contents'in'the'universe''
Vera'Rubin’s'content'of'Universe'
o Dark'Matter:'looking'at'how'things'move'in'the'universe''
o Mostly'containing'dark'matter'
o Only'a'tiny'portion'contains'stars,'planets,'dust,'gas,'etc.'
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