cosmochronometer
plural of croquette
(physics, astronomy) Any process (such as forms of radioactive decay) that may be used to determine the age of an astronomical object.
(zoology) Any extinct primitive amphibian of the family Brachyopidae.
Lacking a pearl or pearls. / (Of an oyster) without a pearl; not producing pearls.
古い恒星団の形成時期を決定するため、天文学者たちはウラン・鉛の崩壊に基づく宇宙年代測定法を適用した。
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