When we desire to leave our sign on Mars today , we simply send over a few Rovers to roll around in its red soil . But 150 years ago , scientists had very different plans for touch the satellite , include one Gallic inventor who require to use the refracted luminance of the sun to sear a welcoming message into the Martian desert .
Charles Cros was a reputable discoverer who developed several primal advancements in color photography and an early version of a phonograph . And he was also convinced that spots of light seen on Mars ( plausibly cloud ) were giant Martian city that we should endeavor to verbalise to . In 1874 he started workplace on anambitious proposalto build up a jumbo mirror that would direct a ray of sunlight towards Mars . But that ’s not all : He want to apply the rays to come in a message on Mars , by burn expectant letters onto the Martian landscape . He expend years petitioning the Gallic regime to establish this mirror until his death in 1888 .
Amazingly enough this is not the only instance where Earthlings wanted to apply mirror to communicate with Mars . Several of Cros ’s French contemporaries , let in astronomers Camille Flammarion and A. Mercier , also had theirown mirror - base proposalsfor developing Martian recounting . Flammarion remember the mirror could be used to flash a kind of morse codification , while Mercier wanted to instal giant mirrors all over the Eiffel Tower , become it into a kind of interstellar disco ball , perhaps as a elbow room to take up attention to our civilized culture . ( You pose ta wonder how many of these were explicate after one too many hours at the neighborhood absinth bar . )

After American astronomer Percival Lowell wrote that he thought he might have ensure canals on Mars in his 1895 book and H.G. Wells publish War of the Worlds in 1897 , the compulsion with communication with Mars reached a spherical fever pitch . In 1919,Popular Science publish a binding storydevoted to several method that might be used to post a message to the Red Planet , as chronicled by a 1920 short film by Max Fleischer called Hello Mars . These plans included put in meg of electric igniter to create an monumental “ newsbreak , ” or — the more affordable version — tying strips of bleak fabric to gargantuan motor to create a lo - fi high - contrast signaling . On the cover was this proposal of marriage : A immense cantilevered mirror that would reflect the sun ’s rays up to the Red Planet . However , caution the cartridge , man had to be patient . Due to the position of Mars in relationship to Earth , we would n’t have a hazard to try our giving flash until 1924 . When 1924 came around , coincidentally , several radio operator close down their outgoing broadcaststhat August , so they might “ heed ” to any message Mars was sample to transport to us .
Although Cros ’s interplanetary magnifying glass seems implausible ( and dangerous ! ) it was not as loco asanother thwart program to pull Martian attention : In 1819 Austrian astronomer Johann von Littrow suggested get down huge fire in geometric shapes across the countryside that the Martians would for sure recognize as a message for them . Building a mirror is one thing but burning down our own major planet to get the tending of another , now that just progress to us sound dire and sad .
double via theSeptember , 1919 number of Popular Science . A prominent lid crown to our intrepid commentermwhite66

https://gizmodo.com/hello-mars-this-is-the-earth-512621065
AstronomyMarsMirrorsPopular Science
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