Illustrations of Mars in 1924 and 1927 showing changes in Solis Lacus, dark feature on Mars.

---

Size: 4252px × 2330px
Location:
Photo credit: © DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, 1900s, 1924, 1927, 20th, artwork, astronomical, astronomy, background, black, century, dark, eye, feature, historical, history, illustration, lacus, map, mars, martian, north, observation, observations, planet, planetary, pole, solar, solis, south, space, surface, system