article_snippet: India's Mars orbiter captured something strange in the gigantic Valles Marineris Canyon of Mars,' video says. '
article_snippet: Dr Fritz Helmut Hemmerich said looking images of the 'cloud' were an optical illusion caused by the angle of the crater with the trench.
article_snippet: This screenshot compares the two images of the same area, with the 'cloud' is only seen on the left .
article_snippet: However, later images showed it was just a chance alignment of shifting dust dunes
highlights_snippet: The image shows a zoomed in section of Valles Marineris canyon .
  
highlights_snippet: Scientists say it is an illusion caused by the angle of crater and trench .
  