Venera 13

• 1. Introduction

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  Venera 13 touched down on Venus on the 1st of March 1982, and then it did something no spacecraft had ever done before: it listened. Microphones recorded the wind moving across the Venusian surface, the clang of the lander striking the ground, the sharp pop of pyrotechnic lens caps firing off, and the grinding of a drill biting into alien soil. For the first time in human history, there was a recording of sound from another planet.

  The temperature outside the lander was 457 degrees Celsius. The atmospheric pressure bore down at 89 times what a person would feel standing at sea level on Earth. The lander had been designed to survive for about 32 minutes under those conditions. It kept working for at least 127 minutes.

  How does a machine endure that? What did it find when it drilled into that surface? And why, decades later, did a scientist look at the photographs Venera 13 sent back and claim to see a scorpion moving across the ground?

• 2. Built for the Window

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  Venera 13 and its twin, Venera 14, were designed to exploit a specific moment: the 1981 Venus launch opportunity, a narrow window when Earth and Venus align favorably for interplanetary travel. The two spacecraft were built as identical vehicles, each with an on-orbit dry mass of 760 kg. Venera 13 launched on the 30th of October 1981 at 06:04 UTC; Venera 14 followed five days later on the 4th of November 1981 at 05:31 UTC.

  The four-month cruise to Venus was not idle time. The cruise stage carried a gamma-ray spectrometer, a UV grating monochromator, electron and proton spectrometers, gamma-ray burst detectors, and solar wind plasma detectors. These instruments gathered data before, during, and after the Venus flyby. The bus continued transmitting observations until at least the 25th of April 1983, long after its primary mission was complete.

  As the lander prepared to separate, the cruise stage had one more job: to act as a radio relay, receiving signals from below and passing them back to Earth. Without it, the data gathered on the surface would have gone nowhere.

• 3. Surviving the Descent

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  On the 1st of March 1982, the descent vehicle separated from the cruise stage and plunged into the Venusian atmosphere. A parachute deployed during the upper descent, then detached at around 50 km above the surface. Below that altitude, simple air braking took over, a departure from earlier Venera landers that had relied on parachutes the whole way down and were prone to failure as a result.

  The lander itself was a hermetically sealed pressure vessel. To cope with the extreme heat, it carried blocks of lithium nitrate, a salt-like material with a very high heat of fusion that absorbed thermal energy rather than letting it reach the instruments inside. The design followed the pattern established by Venera 9 through 12: a ring-shaped landing platform topped by an antenna, with the scientific instruments packed inside.

  Venera 13 struck the surface at around 7-8 meters per second. It came to rest at 7.5 degrees South, 303 degrees East, just east of the eastern extension of an elevated region called Phoebe Regio. The area it landed in was composed of bedrock outcrops surrounded by dark, fine-grained regolith, roughly 950 km southwest of where Venera 14 would set down several days later.

• 4. Science on the Surface

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  Once down, Venera 13 began a panoramic photograph while a mechanical drilling arm went to work on the surface beneath it. Samples were drawn into a hermetically sealed chamber held at 30 degrees Celsius and a pressure of roughly 0.05 atmosphere (5 kPa), insulating the material from the crushing environment outside long enough for analysis.

  The x-ray fluorescence spectrometer examined the regolith and returned a specific classification: the samples fell into the category of weakly-differentiated melanocratic alkaline gabbroids, a type of dark, iron-rich igneous rock. Spring-loaded arms measured how much the surface compressed underfoot, while a dynamic penetrometer and a seismometer gathered additional data about the ground's physical properties.

  The camera system was meant to work through quartz windows protected by lens caps that would pop off after descent. Only one of the two lens caps functioned correctly on Venera 13. Despite that partial failure, the lander produced photographs clear enough to prompt serious scientific debate for decades to come. The instrument list also included a gas chromatograph, a mass spectrometer, a nephelometer, and a hydrometer, all feeding data upward to the relay bus overhead.

• 5. The Scorpion Controversy

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  Leonid Ksanfomaliti of the Space Research Institute of the Russian Academy of Sciences, who had contributed to the Venera mission itself, published an article in the journal Solar System Research alongside Stan Karaszewski of Karas. The paper pointed to objects in the Venera 13 images that Ksanfomaliti described as a "disk", a "black flap", and a "scorpion", objects that, he argued, appeared to emerge, fluctuate, and disappear between photographs.

  Engineers with direct knowledge of the probe identified the moving "disk" as the two lens caps that had been ejected from the lander during descent. Rather than a single object relocating itself, the images showed two separate inanimate objects that happened to look similar, sitting in different positions. The other shapes were attributed to artifacts introduced during image processing and do not appear in the original, unprocessed photographs.

  The journal Solar System Research addressed the claims directly. In Issue 5, Volume 46 of their September 2012 publication, the editors ran an editorial comment alongside commentary articles from other scientists. That same issue included a second article by Ksanfomaliti, in which he extended his claims and speculated about what he called an apparent rich diversity of life around the landing site. The Live Science website was among those to formally refute the claims.

• 6. Afterlife in Orbit

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  After the lander fell silent on the surface, the cruise stage carried on. It settled into a heliocentric orbit and continued making observations across the x-ray and gamma ray spectrum. On the 10th of June 1982, the bus fired its engine to provide data useful for the later Vega mission, a subsequent Soviet program that would send probes toward Halley's Comet via Venus.

  The last data published for Venera 13 carries the date of the 12th of April 1983, more than a year after the lander had finished its work on the surface. The short film Horses on Mars, released in 2001, features the Venera 13 lander delivering a message to a microbe lost on Venus. Carl Sagan's 1985 novel Contact also features the Venera lander. That a machine built to survive 32 minutes left traces in orbit for over a year, and echoes in fiction for decades after, is one of the more quietly remarkable facts about the mission.