The Perseverance rover’s sterilized sample tubes — designed to seal Martian rock and sediment for eventual return to Earth — are installed on the spacecraft as teams at NASA’s Kennedy Space Center prepare to enclose the rover inside the payload shroud of its Atlas 5 launcher for liftoff July 20.

A U.S. Army veteran of Operation Desert Storm, a Russian Air Force MiG-29 fighter pilot, and a former flight controller for Russia’s Mir space station arrived at the International Space Station on Friday, with a smooth docking aboard a Soyuz spaceship at 0952 GMT (5:52 a.m. EDT), two days after a successful launch from Kazakhstan.

An Atlas 5 lifts off at dawn creating a spectacular sky show as it races toward orbit carrying the fifth Advanced Extremely High Frequency (AEHF 5) communications satellite for the U.S. Air Force.