[DOC] [TLE] Harnessing the Power of the Sun - Space.com [PAR] Apr 19, 2007 ... Schiaparelli provocatively referred to the features as canali, ... This spider web of 
canals was, Lowell averred, the engineering work of advanced beings whose ... 
by these two astronomers - every single one - were optical illusions. ... discovery 
about Mars - one that would (eventually) also suggest the... [DOC] [TLE] Mars facts, information, pictures | Encyclopedia.com articles about ... [PAR] Mars is also known as the Red Planet, because it looks reddish from Earth. .... 
believed that the lines on Mars were artificial canals built by an advanced 
civilization. ... that these lines were either natural geological features or an optical 
illusion. ..... These photos revealed that the features once thought to be canals 
were not... [DOC] [TLE] World History Timeline Ancient Greek civilization timeline and ... [PAR] Timeline and overview of the civilization of the Ancient Greeks, one of the most ... 
447: Work begins on the Parthenon in Athens, then at the height of its glory ... In 
any case, the Roman conquest carried many features of Greek civilization to ... 
Greek colonization, and this region was known to the Romans as "Magna Graeca
". [DOC] [TLE] History of Mars observation - Wikipedia [PAR] The recorded history of Mars observation dates back to the era of the ancient 
Egyptian ... When astronomers mistakenly thought they had detected the 
spectroscopic signature of ... These linear features later proved to be an optical 
illusion, and the .... now known as Syrtis Major Planum, and possibly one of the 
polar ice caps. [DOC] [TLE] Martian canal - Wikipedia [PAR] For a time in the late 19th and early 20th centuries, it was erroneously believed 
that there were canals on Mars. These were a network of long straight lines in the 
equatorial regions from 60 ... They could also see Mars' polar ice caps shrinking 
and growing with these changing seasons. It was only when they interpreted... [DOC] [TLE] Percival Lowell - Wikipedia [PAR] Percival Lawrence Lowell was an American businessman, author, mathematician
, and astronomer who fueled speculation that there were canals on Mars. He 
founded the Lowell Observatory in Flagstaff, Arizona and formed the beginning of 
the effort that led to the discovery of Pluto 14 years after his .... Although Lowell 
was better known for his observations of Mars, he also drew... [DOC] [TLE] Prehistoric Cave Paintings discovered in Europe [PAR] Jul 11, 2013 ... The exact purpose of the paleolithic cave paintings is not known. ... Nearly 340 
caves have now been discovered in France and Spain that ... Some researchers 
believe the drawings are too advanced for this era and .... The crossed hind legs 
create the illusion that one bison is closer to us .... Just a thought. [DOC] [TLE] Field Trip - Lowell Observatory [PAR] Though today the "canali" are known to be an optical illusion, Lowell was the 
strongest ... These criteria, though now accepted as essential for optimal 
observing, were ... along with illustrations of the surface features, in three books: 
Mars (1895), ... As one of the oldest observatories in the U.S., the site's history is 
replete with... [DOC] [TLE] Ernst Mach (Stanford Encyclopedia of Philosophy) [PAR] May 21, 2008 ... In philosophy, he is best known for his influence upon the Vienna Circle (a ... It is 
important to note that some of these influences are currently being .... What were 
once thought of as errors of the brain, Mach showed to be adaptations. .... light 
bands along the inner edges of the gradients are optical illusions. [DOC] [TLE] U.F.O. And Reported Extraterrestrial On Moon And Mars [PAR] One unquestionably absolute expert we may want to consult is Christopher Kraft, 
who was ... missions, when he revealed the following conversation after he left 
his work at N.A.S.A.: ... No, no, no .... this is not an optical illusion. ...... However, 
there is also a spiritual civilization on Mars that is so far advanced that the other... [DOC] [TLE] Freeman Dyson - Wikiquote [PAR] Thirty-one years ago [1948], Dick Feynman told me about his "sum over histories

Question: Once thought to be the work of an advanced civilization, these features are now known to be an optical illusion
Answer: Canals