Installing sample tubes onto the Perseverance rover in a clean room facility. All 43 sample tubes have a gold-coloured titanium sheath (centre) to protect them. The sample tubes will be used to collect samples of Martian rock and dust. The Perseverance rover is part of the Mars 2020 mission, which aims to study the geology of Mars and search for signs of life. Photographed at Kennedy Space Center, Florida, USA.