Editing Sputnik 2 (section)

==Launch preparations==
Sputnik 2's launch vehicle, the R-7 ICBM (also known by the system's GRAU index 8K71)<ref>Zaloga, Stephen J.. ''The Kremlin's Nuclear Sword'', Washington.  The Smithsonian Institution Press, 2002, p. 232. {{ISBN|1-58834-007-4}}</ref> was modified for the PS-2 satellite launch and designated 8K71PS.<ref name=challenge/>{{rp|163}} 8K71PS serial number M1-2PS arrived at the NIIP-5 Test Range, the precursor to the [[Baikonur Cosmodrome]], on 18 October 1957 for final integration of the rocket stages and satellite payload.<ref name=drew/> Laika was put in the payload container mid-day 31 October, and that night, the payload was attached to the rocket. The container was heated via an external tube against the cold temperatures at the launch site.<ref name=challenge/>{{rp|173}}