Comet Leonard streaks across the field of view of the NRL SoloHI telescope aboard ESA/NASA's Solar Orbiter spacecraft on Dec. 17-19, 2021. The comet's apparent backward movement is due to the spacecraft's relative motion. SoloHI will continue observing the comet until it leaves its field of view until Dec. 22. (Photo by ESA/NASA/NRL/SoloHI/Guillermo Stenborg)