Laika

• 1. Introduction

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  Laika was a stray mongrel from the streets of Moscow who became the first animal to orbit the Earth. On the 3rd of November 1957, she launched aboard Sputnik 2 into low orbit, riding a wave of Cold War ambition into history. She had no name when she was found wandering the city. She weighed roughly 5 kilograms. She was approximately three years old. And she was never coming back.

  The engineers knew this from the start. The technology to return from orbit had not yet been built. Laika was sent as a sacrifice to science, a living proof that a creature could survive launch and continue to function in the weightlessness and radiation of space. What happened to her in those early hours of flight, and the decades of silence that followed, raises questions that science alone cannot settle.

• 2. A Rushed Spacecraft

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  Nikita Khrushchev, leader of the Soviet Union, wanted a launch on the 7th of November 1957 to mark the 40th anniversary of the October Revolution. The success of Sputnik 1 in October had already stunned the world, and Khrushchev specifically wanted a second "space spectacular" to follow it.

  The problem was time. Sputnik 3, a more sophisticated satellite already under construction, would not be ready until December. The official decision to build a new, simpler craft came on the 10th or the 12th of October, leaving fewer than four weeks. Sergei Korolev proposed putting a dog aboard. The idea was adopted quickly, and engineers built most of the spacecraft from rough sketches.

  Sputnik 2 carried more than just a passenger. It also held instruments measuring solar irradiance and cosmic rays. The life-support system included an oxygen generator, a carbon dioxide absorber, and a fan set to switch on whenever the cabin temperature rose above 15 degrees Celsius. Enough food, pressed into a gelatinous gel, was stocked for seven days. A harness fixed to the cabin walls allowed Laika to stand, sit, or lie down, but left no room to turn around.

• 3. The Dog From Moscow's Streets

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  Soviet scientists chose strays deliberately, on the theory that animals who had survived Moscow winters already knew how to endure cold and hunger. Laika was one of three dogs selected for the mission alongside Albina and Mushka. Space-life scientists Vladimir Yazdovsky and Oleg Gazenko led the training program.

  The dog acquired several names. Soviet personnel called her Kudryavka, meaning Little Curly; Zhuchka, meaning Little Bug; and Limonchik, meaning Little Lemon. The name Laika, the Russian word for several husky-like breeds that translates roughly as "Barker," was the one that spread around the world. Some accounts suggest technicians switched to Laika specifically because of her loud bark. The American press coined the nickname Muttnik, blending "mutt" with the suffix from Sputnik. Her actual pedigree is not certain, though she is generally thought to have been part husky or another Nordic breed, and possibly part terrier. NASA has described her as a "part-Samoyed terrier."

  A Russian magazine characterized her as phlegmatic, noting that she did not quarrel with other dogs. Ten days before the launch, Yazdovsky chose her as the primary flight dog. He then took her home to play with his children. In a book about Soviet space medicine, he described her as "quiet and charming" and wrote that he wanted to do something kind for her, knowing she had so little time left.

• 4. Training and Preparation

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  To accustom the dogs to the cramped interior of Sputnik 2, trainers kept them in progressively smaller cages for stretches lasting up to twenty days. The prolonged confinement caused the animals to stop urinating and defecating, left them restless, and degraded their physical condition. Laxatives provided no relief; only extended periods of training helped.

  The dogs were placed in centrifuges to simulate rocket acceleration and in machines that reproduced the sounds of the spacecraft. Both devices pushed their pulse rates to double the normal rate and raised their blood pressure significantly. They were also trained to eat the special high-nutrition gel that would serve as their food in orbit: a mixture of 40 percent bread crumbs, 40 percent powdered meat, and 20 percent beef fat, combined with agar and water.

  Albina, who had already flown twice on high-altitude test rockets, was designated Laika's backup. Yazdovsky declined to send Albina as the primary because she had recently given birth to three pups, and he considered it cruel to separate her from them. Mushka, the third dog, stayed on the ground as a control animal, used to verify instrumentation and life support.

  Before the crew left for Baikonur Cosmodrome, Yazdovsky and Gazenko performed surgery on the dogs to route cables from transmitters to the sensors that would track breathing, pulse, and blood pressure. Because the airstrip near the cosmodrome was too small for heavy aircraft, the team first flew on a Tu104 to Tashkent, then transferred to a lighter Il14 for the final leg to Turatam.

• 5. Hours Into the Flight

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  According to a NASA document, Laika was placed inside the satellite's capsule on the 31st of October 1957, three days before launch. Temperatures at Baikonur were severe at that time of year, and a hose connected to a heater kept her container warm while two assistants maintained a constant watch. Just before liftoff, her fur was sponged with a weak ethanol solution and carefully groomed, and iodine was painted on the areas where sensors would be placed. One technician later recalled that the team kissed her nose and wished her "bon voyage" before sealing the hatch.

  At peak acceleration, Laika's respiration climbed to three or four times its pre-launch rate. Her heart rate, recorded at 103 beats per minute before launch, surged to 240 beats per minute during the early acceleration phase. After reaching orbit, the nose cone separated successfully, but the central "Block A" core failed to detach as planned. The failure disrupted the thermal control system. Some thermal insulation also tore free, and the cabin temperature rose to 40 degrees Celsius.

  After three hours of weightlessness, Laika's pulse had settled back to 102 beats per minute, though that recovery took three times longer than it had in ground tests, indicating sustained stress. Early telemetry showed she was agitated but still eating. Approximately five to seven hours into the flight, signals from the spacecraft went silent. In October 2002, scientist Dimitri Malashenkov revealed at the World Space Congress in Houston, Texas, that Laika had died by the fourth orbit from overheating. He noted that the engineers had found it "practically impossible to create a reliable temperature control system in such limited time constraints."

• 6. What the Soviet Union Told the World

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  For decades, the true cause and timing of Laika's death were not made public. The Soviet government initially claimed she had been euthanised before her oxygen ran out. Another widely circulated version held that she died on day six when the oxygen supply was exhausted. In 1999, several Russian sources stated she had died on the fourth day from overheating, but the full account did not emerge until Malashenkov's 2002 disclosure.

  Sputnik 2 itself continued orbiting long after Laika was gone. After 2,570 orbits and more than five months in space, the spacecraft disintegrated during re-entry on the 14th of April 1958. The first successful recovery of animals from orbit came two years after Laika's mission, when Korabl-Sputnik 2 returned the dogs Belka and Strelka safely to Earth in 1960, also validating the crewed Vostok design.

• 7. A Global Ethical Debate

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  Sputnik 2 was never designed to return, and Western audiences learned quickly that Laika would not survive. In the United Kingdom, the National Canine Defence League called on dog owners to observe a minute's silence for each day she remained in space. The Royal Society for the Prevention of Cruelty to Animals received protests before Radio Moscow had even finished announcing the launch. In the United States, demonstrators gathered outside the United Nations in New York. Animal rights groups across several countries urged protests at Soviet embassies.

  Criticism in Warsaw Pact countries was harder to voice under political censorship, but a Polish scientific periodical called Kto, Kiedy, Dlaczego published a discussion of the Sputnik 2 mission in 1958. In its astronautics section, Krzysztof Boruñ described the mission as "regrettable" and called the failure to bring Laika back alive "undoubtedly a great loss for science."

  In 1998, Oleg Gazenko, one of the scientists who had prepared Laika for flight, gave his own verdict. He said that work with animals is a source of suffering, that researchers treat them like babies who cannot speak, and that the more time passed, the sorrier he was. His conclusion was direct: "We shouldn't have done it. We did not learn enough from this mission to justify the death of the dog."

  Four other Soviet space dogs later died on missions: Bars and Lisichka were killed when their R7 rocket exploded on the 28th of July 1960, and Pchyolka and Mushka died when Korabl-Sputnik 3 had to be detonated after an emergency.

• 8. Monuments and Memory

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  A statue and plaque at Star City, the Russian Cosmonaut training facility, memorialise Laika. The sculpture, created in 1997, shows her positioned behind the cosmonauts with her ears erect. The Monument to the Conquerors of Space in Moscow, built in 1964, also includes her image. On the 11th of April 2008, a separate monument was unveiled at the Moscow military research facility that had prepared her flight, depicting her standing atop a space rocket.

  Stamps, envelopes, cigarettes, and matches bearing her likeness were produced. In 1988, the Spanish band Mecano released a song in her honour; its closing lines describe there being one less dog on the Earth and one more star in the sky. The 2007 graphic novel Laika, by Nick Abadzis, won multiple Eisner Awards and appeared on the YALSA Top Ten Great Graphic Novels for Teens list; it tells a fictionalized account of her life from the perspectives of politicians, scientists, and engineers.

  Norwegian singer Emmy released a song titled "Laika Party" in 2025 to compete in the Irish Eurosong selection for that year's Eurovision Song Contest. The song imagines Laika alive and living happily in space. Emmy won the selection to represent Ireland at the contest, meaning a stray dog found wandering Moscow streets in the mid-1950s still inspires music on one of the world's largest competitive stages nearly seven decades later.