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21 février 21 avril Chronologies thématiques Croisades Ferroviaires Sports Disney Anarchisme Catholicisme Abréviations / Voir aussi (° 1852) = né en 1852 († 1885) = mort en 1885 a.s. = calendrier julien n.s. = calendrier grégorien Calendrier Calendrier perpétuel Liste de calendriers Naissances du jour modifier Le 21 mars est le 80 e jour , moins souvent le 81 e , de l' année du ...
1904 – Forrest Mars, Sr., American candy maker, created M&M's and Mars bar (d. 1999) 1904 – Nikos Skalkottas, Greek violinist and composer (d. 1949) 1905 – Phyllis McGinley, American author and poet (d. 1978) 1906 – André Filho, Brazilian musician and songwriter (d. 1974) 1906 – John D. Rockefeller III, American philanthropist (d. 1978)
Mars is the fourth planet from the Sun. The surface of Mars is orange-red because it is covered in iron(III) oxide dust, giving it the nickname "the Red Planet". Mars is among the brightest objects in Earth's sky, and its high-contrast albedo features have made it a common subject for telescope viewing.
21 al 27 de marzo: Semana de solidaridad con los pueblos que luchan contra el racismo y la discriminación racial. Por países (Por orden alfabético) Chile: Día de la Fuerza Aérea de Chile. México: Aniversario del Natalicio de Benito Juárez. Namibia: Día de la Independencia. Palestina: Día de la Madre Palestina.
Su magnitud aparente alcanza −2.97, 21 y es solamente superada por Júpiter, Venus, la Luna y el Sol. Los telescopios ópticos terrestres están normalmente limitados a resoluciones de aproximadamente 300 km (190 millas) de distancia, cuando la Tierra y Marte están más cercanos, debido a la atmósfera terrestre. 22 .
Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape. NASA missions have found lots of evidence that Mars was much wetter and warmer, with a thicker atmosphere, billions of years ago.
The geology of Mars is the scientific study of the surface, crust, and interior of the planet Mars. It emphasizes the composition, structure, history, and physical processes that shape the planet. It is analogous to the field of terrestrial geology.
