内容简介
Therearetwoaspectsofcosmologytodaythatmakeitmorealluringthanever.First,thereisanenormousamountofdata.Togivejustoneexampleofhowrapidlyourknowledgeofthestructureoftheuniverseisadvancing,considergalaxysurveyswhichmapthesky.In1985,thestate-of-the-artsurveywastheonecarriedoutbytheCenterforAstrophysics;itconsistedofthepositionsof1100galaxies.Today,theSloanDigitalSkySurveyandtheTwoDegreeFieldbetweenthemhaverecordedthe3Dpositionsofhalfamilliongalaxies.