An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other. In contrast, globular clusters ...

Wer bei einem richtig schwierigen Erdkunde-Quiz nicht alle Fragen richtig beantworten kann, muss sich nicht schämen. Es ist ...

Galaxies and clusters are the ensembles of stars and other astronomical objects bound together by gravitational forces. Galaxies are ordered into galaxy groups, which are in turn organised into ...