Caption: 
The Southwest Research Institute-led Ultraviolet Spectrograph (UVS) aboard NASA’s Europa Clipper spacecraft has successfully completed its initial commissioning following the October 14, 2024, launch. Weighing just over 40 pounds and drawing only 7.9 watts of power, Europa-UVS is smaller than a microwave oven, yet this powerful instrument will determine the relative concentrations of various elements and molecules in the atmospheres of Jupiter’s moons once it arrives in the Jovian system in 2030.