| Найдено документов: 487 (1 сайтов) ---- Время поиска: 0.05сек. |
Показаны документы, содержащие фрагменты текста из документа
http://www.badastronomy.com/bitesize/constellation.html.
http://www.badastronomy.com/bitesize/constellation.html.
1. Phil Plait's Bad Astronomy: Bitesize Astronomy
... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...
[
Сохраненная копия
]
Ссылки http://www.badastronomy.com/bitesize/openclusters.html -- 20.2 Кб -- 09.04.2016
Похожие документы
Похожие документы
Еще в разделе:
(Показать все результаты (>487) - www.badastronomy.com/ )