Cosmonauts on ISS spacewalk encounter toxic coolant 'blob' while inspecting leaky radiator

Cosmonauts will hunt for source of ISS leak during a spacewalk today. Watch it live

Expedition 70 on ISS: Spacewalk Prep, Coolant Concerns, CEVIS Systems, and CIPHER Studies

NASA astronaut Frank Rubio considers himself 'incredibly lucky' after accidental 1-year ISS stay