4 ms·

excellent graphic linked in the article: http://www.spectrum.ieee.org/image/79352 http://www.spectrum.ieee.org/image/79352

• ars 17y ago
  A red color doesn't mean failure BTW. It means Russia, it's just Russia has not had much luck with Mars.
  • dangoldin 17y ago
    Russia/Soviet Union had some decent success with Venus though which is supposedly more difficult.