Поиск по: -
Поискать по всем серверам
На этой странице приведены все страницы, которые ссылаются на http://www.astrosociety.org/edu/publications/tnl/56/SN1987A.html. Показаны документы 1 - 1 из 1.
1. ASP: An Ancient Universe - The Age of the Chemical Elements
An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . ... d) The Age of the Chemical Elements . ... Some isotopes (forms of the element with different numbers of neutrons in the nucleus) of these elements are radioactive; they change into other isotopes at a rate that can be measured accurately in the laboratory. ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...
[
Сохраненная копия
]
Ссылки http://www.astrosociety.org/edu/publications/tnl/56/ancient4.html -- 8.8 Кб -- 02.10.2012
Похожие документы
Похожие документы