What happened in the 1880s?
๐ Astronomical Observations of Mars' Canals (1888): Popularization of space exploration and extraterrestrial life theories.
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Further Reading
Seeing and Interpreting Martian Oceans and Canals | Life on Other ... (loc.gov)
The canals of Mars-historical note (nasa.gov)
Tracing the Canals of Mars: An Astronomer's Obsession - Space.com (space.com)
Martian canals - Wikipedia (wikipedia.org)
Canals of Mars | Ancient Waterways, Martian Geology & Exploration (britannica.com)
One Astronomer's Quest to Expose the Alien-Built Canals of Mars (wired.com)
People Used to Believe Aliens Built Canals on Mars. Here's Why ... (newspapers.com)
The canals on Mars - NASA/ADS (harvard.edu)