7.4K views · 704 reactions | On this date in 2008, our MESSENGER spacecraft made its first flyby of Mercury, and captured this color-enhanced portrait of the planet’s complex surface. MESSENGER went on to orbit Mercury, revealing many of its secrets. More: https://go.nasa.gov/2Ry4Jbu | NASA Solar System Exploration | Facebook

Jupiter's moon Io is the most volcanically active body in the solar system. Our #JunoMission collected data during multiple close flybys of Io, and analysis suggests that each volcano is likely powered by its own magma chamber, rather than a subsurface ocean of magma: https://www.missionjuno.swri.edu/news/juno-uncovers-heart-of-jovian-moon-s-volcanic-rage | NASA Solar System Exploration