After reaching orbit, Sputnik 2's nose cone was jettisoned successfully; however the "Block A" core did not separate as planned, preventing the thermal control system from operating correctly.
Setelah mencapai orbit, moncong Sputnik II berhasil dilepaskan, namun inti "Blok A" tidak terlepas seperti yang direncanakan, sehingga sistem pengendalian suhu tidak beroperasi seperti semestinya.