Credit: Iewek Gnos/Unsplash

Using a new technique to analyze old synthetic aperture radar data, researchers observed direct evidence of a Venusian lava tube about 300 meters tall and 1 kilometer in diameter. Here an artist’s depiction shows a cross section of the tube. Credit: RSLab, University of Trento

The MESSENGER mission took this image of streaks, or lineae, on a crater wall on Mercury on 10 April 2014. Credit: NASA/JHUAPL/Carnegie Institution of Washington