Martian canals

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Early observers noticed first "seas" and later "canals" on the surface of Mars, starting with the discovery of Syrtis Major by Huygens.[1]

While illusory, the canals remain visible in telescopes.[2]


  1. P. Lowell - Mars and its canals 1906. p. 23
  2. R.B. Thompson & B.F. Thompson - Astronomy hacks: Tips & tools for observing the night sky 2005. ISBN 978-0-596-10060-5 p. 162