On This Day in Space! Dec. 23, 1672: Giovanni Cassini discovers Saturn's moon Rhea
On This Day in Space! Dec. 23, 1672: Giovanni Cassini discovers Saturn's moon Rhea Space 23/12/2020 Hanneke Weitering © Provided by Space Saturn's moons Rhea and Janus tango on opposite sides of the planet's famous ring system in this new color-enhanced image from NASA's Cassini orbiter. Rhea, Saturn's second-largest moon, is visible in the foreground, while the smaller moon Janus is pictured in the distance across the rings. Citizen scientist Kevin Gill recently processed this 10-year-old view of Saturn and two of its moons using calibrated red, green and blue filtered i...