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The anniversary of the Soviet probes Venera 5 and Venera 6 marked 57 years on Sunday, May 17, 2026, marking the date when humanity came closer to the surface of Venus than any subsequent mission. The Venera 6, launched by the Soviet Union on January 10, 1969, entered the night atmosphere of the second planet in the solar system at 06:05 UTC on May 17, 1969, transmitted data for 51 minutes under parachute, and stopped functioning at approximately 10 kilometers altitude, crushed by the pressure of 60 bar and the suffocating heat of the deep layers of the Venusian atmosphere.
The twin probe, Venera 5, had arrived a day earlier, on May 16, 1969, and transmitted for 53 minutes before its 405-kilogram capsule gave in at approximately 24 kilometers altitude, recording 320 degrees Celsius and 26 bar of atmospheric pressure at the last contact.
According to archived data by the Wikipedia on the Venera program, both capsules weighed 1,130 kilograms at launch, were designed by the Lavochkin Design Bureau in Khimki, near Moscow, and used smaller parachutes than previous models precisely to accelerate the descent and reach greater depth before the battery ran out.
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Why 57 years later no nation has successfully landed on Venus again
The atmosphere of Venus maintains conditions close to the boundary of the physics of known materials: 460 degrees Celsius average temperature on the surface, 90 atmospheres of pressure equivalent to being 900 meters below the ocean, and permanent clouds of sulfuric acid that corrode any exposed metal in minutes. The combination brought down all 29 Soviet and American missions that attempted to cross these layers between 1961 and 1985.
According to the record of the Guinness World Records, the longest survival time of any spacecraft on the Venusian surface remains 127 minutes, recorded by the Venera 13 probe on March 1, 1982, more than four decades ago. Beyond this limit, no equipment built by humanity has withstood more than a few seconds to the combined assault of heat, pressure, and acid.
According to researchers working on NASA’s planetary exploration program, the closer a probe tries to get to the surface, the faster its instruments melt, its cameras darken from chemical corrosion, and its radios lose the ability to modulate signal due to the extreme density of the lower layers of the Venusian atmosphere.
The scientific leap that Venera 5 and 6 made in just 51 minutes
The two probes were launched in January 1969 with five-day windows between them and traveled 257 million kilometers to reach Venus in 131 days of flight. The central objective was to confirm and refine the atmospheric measurements made by the predecessor Venera 4, in 1967, which had been the first spacecraft to transmit direct data during descent on another planet.
During the free fall slowed by parachutes, Venera 5 and Venera 6 measured pressure between 0.13 and 40 atmospheres, temperatures that jumped from 25 to over 320 degrees Celsius, chemical composition of the air with absolute dominance of carbon dioxide, light intensity of 250 watts per square meter, and air density up to fifty times greater than Earth’s at the final contact altitude.
These data laid the foundations of current models of runaway greenhouse effect, a phenomenon that turned Venus into a planetary oven and continues to be studied by terrestrial climatologists as a limit scenario of global warming. The very runaway greenhouse theory gained traction after Venera 5 and 6’s transmissions showed omnipresent carbon dioxide above 24 kilometers altitude.
The Lavochkin Bureau and the Soviet race for Venus
The Lavochkin Design Bureau in Khimki was designated in 1965 by the Soviet government as the exclusive responsible for the Venera line after the Korolev Bureau began focusing on the lunar race against the United States. Under the leadership of engineer Georgy Babakin, the Khimki team produced 16 probes between 1965 and 1984, of which 10 managed to transmit useful data from Venus.
The partial success of Venera 5 and 6 motivated a deep review of the materials used in the descent capsule and paved the way for Venera 7, which on December 15, 1970, finally managed to land and transmit 23 minutes of data from the Venusian surface, a historical milestone still listed today as the first landing on another planet with confirmed data transmission.
According to technical files detailed by the Drew Ex Machina portal, maintained by veteran space engineer Andrew LePage, Venera 5 and Venera 6 also carried capsules with symbolic engravings of the Soviet emblem and low-relief medallions of Vladimir Lenin, strategically launched over the night side of the planet.
The new generation of missions to Venus that could break the record in 2031
NASA approved in 2021 the DAVINCI mission, short for Deep Atmosphere Venus Investigation of Noble Gases, Chemistry and Imaging, scheduled for launch in 2029 and arrival in June 2031. According to the official DAVINCI mission site, the probe will descend for approximately one hour through the atmosphere, repeating the feat of Venera 5 and 6 with modern instruments six decades later.
The European Space Agency has also advanced in parallel with the EnVision mission, which is expected to be launched in 2031 to map Venus from space with high-resolution radar, without diving into the atmosphere. Together, DAVINCI, EnVision, and the Russian candidate Venera-D, still in the study phase, represent the largest Venusian exploration package since the end of the Soviet program in 1984.
On the other hand, none of the announced missions so far have the primary goal of landing and operating for more than a few hours on the surface. The technological barrier that destroyed Venera 5 and 6 remains unsolved on an industrial scale, and scientists studying metal alloys for extreme environments have been working on prototypes of electronics based on silicon carbide capable of functioning at temperatures above 500 degrees Celsius.
Why Brazil follows the race for Venus even without its own program
Brazil maintains an active partnership with the National Institute for Space Research and the Brazilian Space Agency in cooperation projects with NASA, ESA, and the Chinese space agency, focusing on remote sensing and meteorology. Brazilian researchers regularly publish on comparative planetary physics using data from international missions to Venus as a reference for studying Earth’s atmosphere.
As pointed out by academic groups from the University of São Paulo and the Federal University of Rio Grande do Sul, understanding the runaway greenhouse effect of Venus offers concrete clues about the theoretical limits of Earth’s global warming, especially in scenarios of uncontrolled fossil fuel burning in the coming decades.
This cross scientific interest is the reason why events like the anniversary of Venera 5 and 6 continue to appear in Brazilian academic forums and in content from our Curiosities and Science sections, which gather other discoveries about space exploration and comparative climatology.
The Venus record that survived four decades of technology
The fact that Venera 13 has maintained its record of 127 minutes of survival on the surface for 44 consecutive years speaks as much about the ingenuity of Soviet engineers as about the physical complexity of operating machines on Venus. No space agency has managed to surpass this number, and the realistic expectation is that the next generation of missions will last between a few dozen minutes and a few hours on the Venusian ground.
Still, the legacy of Venera 5 and 6 goes far beyond the measured time. The two probes inaugurated a methodology of controlled atmospheric descent by reduced parachutes, continuous transmission of telemetered data, and independent chemical instrumentation that remains a model for the missions approved and planned until 2031.
The 57th anniversary arrives at a time when three major space programs simultaneously target the evening star for the first time since the 1980s. Venera 6 paved the way. The next generation just needs to last a few more minutes than it did, and this is a race that starts again this decade.
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