Observations and explorations of Venus wiki page English Chak Ek’ Chak Ek’ Spacecraft missions English Observations and explorations of Venus English English English Chak Ek’ English Observations and explorations of Venus English Observations and explorations of Venus Observations and explorations of Venus English optical observations of Venus Chak Ek’ English Venus Rover en.wikipedia.org/wiki/Observations_and_explorations_of_Venus Chak Ek’ Observations and explorations of Venus rovers English English measured in minutes Chak Ek’