Classical planet
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A classical planet is an astronomical object that is visible to the naked eye and moves across the sky and its backdrop of fixed stars, appearing as wandering stars. Visible to humans on Earth there a
A table of alchemical symbols from Basil Valentine’s The Last Will and Testament, 1670 CE
Mars
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Mars is the fourth planet from the Sun. It is also known as the "Red Planet", for its orange-red appearance. Mars is a desert-like rocky planet with a tenuous atmosphere that is primarily carbon dioxi
Classical planet
…on Earth there are seven classical planets (the seven luminaries). They are from brightest to dimmest: the Sun, the Moon, Venus, Jupiter, Mercury, Mars and Saturn. Greek astronomers such as Geminus and Ptolemy recorded these classical planets during classical antiquity, introducing the term planet…
Valles Marineris, taken by the Viking 1 probe
Artist concept showing sand-laden jets erupting from Martian geysers (published by NASA; artist: Ron Miller)
A 30 meter wide and 800 meter high dust devil. Dust devils of 20 kilometer height have been observed.
Dust devils cause twisting dark trails on the Martian surface