Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

(CNN) -- Two Russian cosmonauts on Mir ended a longer-than-expected internal spacewalk on Monday but left some work unfinished after a snag prevented a complete rewiring of the space station's solar ...

Reach for the stars with MIR’s fall Russian space tour. Guests will be able to tour Russia’s premier cosmonaut training facility, Star City, participate in optional cosmonaut training and meet top ...