Thursday, March 3, 2016

Our Moon and the Galilean Moons

The Astronomy Picture of the Day (APOD) today is too darned good not to share. It's an image (credit: Phillip A Cruden) of our Moon along with more distant points of light from the Galilean Moons and Jupiter. Here's the image along with the text from APOD:

"Some of the Solar System's largest moons rose together on February 23. On that night, a twilight pairing of a waning gibbous Moon and Jupiter was captured in this sharp telescopic field of view. The composite of short and long exposures reveals the familiar face of our fair planet's own large natural satellite, along with a line up of the ruling gas giant's four Galilean moons. Left to right, the tiny pinpricks of light are Callisto, Io, Ganymede, [Jupiter], and Europa. Closer and brighter, our own natural satellite appears to loom large. But Callisto, Io, and Ganymede are actually larger than Earth's Moon, while water world Europa is only slightly smaller. In fact, of the Solar System's six largest planetary satellites, only Saturn's moon Titan is missing from the scene."