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[[Category:Japanese geologists]] [[Category:20th-century geologists]] ...

...[[age of the universe]]. The problem was that at various times in the 20th century, the universe was estimated to be younger than the oldest observed stars. E ...years old, but with large uncertainty.<ref>{{cite book |title=Making 20th Century Science: How Theories Became Knowledge |first1=Stephen G. |last1=Brush |fir ...

In the nineteenth century large-scale photographic spectroscopic surveys of stars were performed at [ ...tral type by a [[color index]] (in diagrams made in the middle of the 20th Century, most often the [[B-V color]]) of the stars. This type of diagram is what ...

...aa.gov-US|access-date=2016-05-13}}</ref> This complicated measurements for geologists using [[carbon dating]]. However, some [[oceanographer]]s benefited from th ...and has impacted work of biologists studying [[lipid]] [[biomarker]]s, and geologists studying ancient oil. Reactions responsible for exchange include<ref name=" ...