Photos: Ariane 5 on its jungle launch pad with navigation payloads

Three space station crew members made final preparations Friday for undocking and landing in Kazakhstan early Saturday to close out a 186-day stay in orbit.

After prepping their patient — a $2 billion cosmic ray detector — during two earlier spacewalks, two space station astronauts ventured back outside for a third outing Monday to carry out what amounted to transplant surgery, installing replacement coolant pumps in a bid to revive the costly instrument and extend its life.

Two geostationary communications satellites rode an Ariane 5 rocket into orbit Wednesday from a launch pad in French Guiana, embarking on missions to broadcast television across Europe, the Middle East and Africa, link European air travelers with Wi-Fi, and relay video and data signals across India.