Labels: text | screenshot | electronics OCR: FIRST OBSERVATIONS THE CANALS OF MARS OBSERVATIONS FIRST OBSERVATIONS OF SPACE PROBES A shimmering, blood-red dot in the sky ... a strange, shiftingissini heavenly body. Thus, it was called a planet-or "wanderer in Greek-and named after the savage Roman god of war Mars. Until the 17th century, this was all we knew about the planet Mars. Then, in 1590, Zacharie Jensen, who made lens for eyeglasses, invented the astronomical telescope-by chance, as legend has it. Galileo enthusiastically took advantage of this invention and around 1610 made his first observations of Mars, noting that it was not perfectly round. Ch. Huygens Not long after, the brilliant Dutch scientist Christiaan Huygens built his own telescope and established that the planet rotates on its axis. In 1659, Huygens wrote in his journal: "The planet seems to make its rotation in 24 hours, like the Earth." Five years later, Jean-Dominique Cassini determined the exact rotation time, within three minutes: 24 hours and 37 minutes. MARS BETAT
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