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Lecture 10

AST101H5 Lecture Notes - Lecture 10: Planetary System


Department
Astronomy
Course Code
AST101H5
Professor
John Lester
Lecture
10

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Are$there$other$Solar$Systems?
Called$"extrasolar" planets$or$"exoplanets" bc$they$are$exterior$to$our$
solar$systems
If$the$Nebular$Theory$is$correct,$then$planets$form$when$stars$form$
Can$we$detect$exoplanets?
Stars$are$huge$and$emit$tremendous$amounts$of$light
Planets$are$very$tiny$and$only$reflect$a$small$fraction$..
Directly$observing$exoplanets
Must$eliminate$blurring$by$earth's$atmosphere
Must$block$out$the$star's$light$to$see$the$much$fainter$next$to$the$star$
Planets$orbit$around$the$star$over$time$
!
Planets$move$with$the$star$through$space
!
Must$prove$any$detection$is$really$a$planet
A$few$detections$so$far$
Bc$a$star$is$so$much$brighter$and$larger$than$its$planets
Chapter(10(+Discovery(of(Other(Solar(Systems(
Thursday,$ November$ 26,$2015
1:09$PM
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