In October 2002, Dimitri Malashenkov, one of the scientists behind the Sputnik 2 mission, revealed that Laika had died by the fourth circuit of flight from overheating. ... Over five months later, after 2,570 orbits, Sputnik 2—including Laika's remains—disintegrated during re-entry on 14 April 1958.

It makes you think... what's really out there??