On November 3, 1957, Laika became one of the first animals in space, and the first animal to orbit the Earth. Laika was a stray mongrel from the streets of Moscow, who was selected to be the occupant of the Soviet spacecraft Sputnik 2.
Little was known about the impact of spaceflight on living creatures at the time of Laika's mission, and the technology to de-orbit had not yet been developed, so Laika's survival was never expected. Some scientists believed humans would be unable to survive the launch or the conditions of outer space, so engineers viewed flights by animals as a necessary precursor to human missions. The experiment aimed to prove that a living passenger could survive being launched into orbit and endure a micro-g environment, paving the way for human spaceflight and providing scientists with some of the first data on how living organisms react to spaceflight environments.
Sputnik 2 was not designed to be retrievable, and it had always been accepted that Laika would die. The mission sparked a debate across the globe on the mistreatment of animals and animal testing in general to advance science.
In 1998, after the collapse of the Soviet regime, Oleg Gazenko, one of the scientists responsible for sending Laika into space, expressed regret for allowing her to die:
Work with animals is a source of suffering to all of us. We treat them like babies who cannot speak. The more time passes, the more I'm sorry about it. We shouldn't have done it... We did not learn enough from this mission to justify the death of the dog.
In other Warsaw Pact countries, open criticism of the Soviet space program was difficult because of political censorship, but there were notable cases of criticism in Polish scientific circles. A Polish scientific periodical, "Kto, Kiedy, Dlaczego" ("Who, When, Why"), published in 1958, discussed the mission of Sputnik 2. In the periodical's section dedicated to astronautics, Krzysztof Boruń described the Sputnik 2 mission as "regrettable" and criticised not bringing Laika back to Earth alive as "undoubtedly a great loss for science".
On 11 April 2008, Russian officials unveiled a monument to Laika. A small monument in her honour was built near the military research facility in Moscow that prepared Laika's flight to space. It portrayed a dog standing on top of a rocket. She also appears on the Monument to the Conquerors of Space in Moscow.
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