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A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas dust, and an important but poorly understood component tentatively dubbed dark matter.It is also called 'milky way'

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Secteur d’activité/Domaine : Astronomie
Catégorie : Galaxie
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The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.

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Secteur d’activité/Domaine : Vacances Catégorie : Fêtes religieuses

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Ash Wednesday is observed by Christians. Marking the first day of Lent, which lasts until Easter (a period of 46 days), it is the day of repentance. ...