This would have been a big event for Troekes! Another flight to Mars, this time by NASA. Mars 2020, the so called 5th mission with a rover and 1st with a small helicopter happily landed on the red planet on February 2021. After a long ride of 470 millions kilometers, related to distance from sun. Successfully first time ever colour pictures  and sound recordings were transmitted to the earth,  the chemical turnover from carbodioxid to oxygen succeeded, also the short surround flight of the helicopter.  Use the link to know more @New York Times.

Heinz Troekes “Cosmic Mission” several times dealt with Mars, the planets and views from above.
On the left, the oil painting “BILD FÜR MARS”, 1957 exhibited at Museo de Arte Moderne Rio de Janeiro (MAM) in 1960.