{"title":"Cosmology in an Inhomogeneous Universe","authors":"","doi":"10.2307/j.ctvxrpxvb.18","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.18","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"16 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133617044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Realm of the Nebulae","authors":"Large Magellanic Cloud","doi":"10.2307/j.ctvxrpxvb.7","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.7","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115163519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the 1920s, Edwin P. Hubble discovered that distant galaxies were all moving away from the Milky Way. Not only that, the farther away he observed, the faster the galaxies were receding. He found the relationship that is now known as Hubble's Law: the recessional velocity of a galaxy is proportional to its distance from us. The equation is: v = Ho × d, where v is the galaxy's velocity (in km/sec), d is the distance to the galaxy (in megaparsecs; 1 Mpc = 1 million parsecs), and Ho is the proportionality constant, called "The Hubble constant."
20世纪20年代，埃德温·p·哈勃发现，遥远的星系都在远离银河系。不仅如此，他观察到的距离越远，星系后退的速度就越快。他发现了现在被称为哈勃定律的关系:星系的衰退速度与它与我们的距离成正比。方程是:v = Ho × d，其中v是星系的速度(单位为千米/秒)，d是到星系的距离(单位为百万秒差距;1 Mpc = 100万秒差距)，Ho是比例常数，被称为“哈勃常数”。
{"title":"The Expanding Universe","authors":"","doi":"10.2307/j.ctvxrpxvb.9","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.9","url":null,"abstract":"In the 1920s, Edwin P. Hubble discovered that distant galaxies were all moving away from the Milky Way. Not only that, the farther away he observed, the faster the galaxies were receding. He found the relationship that is now known as Hubble's Law: the recessional velocity of a galaxy is proportional to its distance from us. The equation is: v = Ho × d, where v is the galaxy's velocity (in km/sec), d is the distance to the galaxy (in megaparsecs; 1 Mpc = 1 million parsecs), and Ho is the proportionality constant, called \"The Hubble constant.\"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127682813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Measures of the Galaxy Distribution","authors":"","doi":"10.2307/j.ctvxrpxvb.23","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.23","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129547143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Dynamical Mass Measures","authors":"","doi":"10.2307/j.ctvxrpxvb.24","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.24","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132068631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Motions of Free Test Particles","authors":"","doi":"10.2307/j.ctvxrpxvb.13","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.13","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125209401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Wall, String, and Spherical Solutions","authors":"","doi":"10.2307/j.ctvxrpxvb.15","DOIUrl":"https://doi.org/10.2307/j.ctvxrpxvb.15","url":null,"abstract":"","PeriodicalId":390001,"journal":{"name":"Principles of Physical Cosmology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127949180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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