amazing photo of the Orion nebula's center, a cloud of gas and dust known as The work was created by Adam Block at the Mount Lemon Sky Center observatory in Arizona. Image: Adam Block/Mount Lemmon SkyCenter/University of Arizona
Tranquil The surface area of Saturn's moon Mimas is composed of water ice with only a small amount of rock. Yet Saturn's resonances with Mimas, and Mimas' resonances with other orbiting satellites are instrumental in the formation of Saturn's rings.
This "family portrait" is a composite of the Jovian system: the edge of Jupiter with its Great Red Spot + Jupiter's 4 largest moons, known as the Galilean satellites. The moons (top-to-bottom): Io, Europa, Ganymede and Callisto.
NASA's Hubble Space Telescope picture of a rare alignment of three of Jupiter's largest moons – Io, Ganymede, and Callisto – across the planet's face. Photo Credit - NASA, ESA, and E. Karkoschka (University of Arizona)