Korolev and close associate Mstislav Keldysh wished to up the ante of building a second, larger satellite by proposing the idea of putting a dog on board, which sufficiently caught the interest of the Soviet Academy of Sciences. This new Sputnik 2 spacecraft had six times the mass of the Sputnik 1, and carried the dog Laika as a payload. The entire vehicle was designed from scratch within four weeks, with no time for testing or quality checks. It was successfully launched on 3 November and Laika was placed in orbit. There was no mechanism to bring the dog back to Earth; the dog died from heat exhaustion after five hours in space.