Astronomy Picture of the Day (Unofficial)

Astronomy Picture of the Day for 2017-05-14 12:30:02.289636

Astronomy Picture of the Day (Unofficial) at

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2017 May 14
See Explanation. Clicking on the picture will download
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Ganymede: The Largest Moon
Image Credit: NASA, JPL, Galileo Probe

Explanation: What does the largest moon in the Solar System look like? Jupiter's moon Ganymede, larger than even Mercury and Pluto, has an icy surface speckled with bright young craters overlying a mixture of older, darker, more cratered terrain laced with grooves and ridges. The large circular feature on the upper right, called Galileo Regio, is an ancient region of unknown origin. Ganymede is thought to have an ocean layer that contains more water than Earth and might contain life. Like Earth's Moon, Ganymede keeps the same face towards its central planet, in this case Jupiter. The featured image was taken about 20 years ago by NASA's Galileo probe, which ended its mission by diving into Jupiter's atmosphere in 2003. Currently, NASA's Juno spacecraft orbits Jupiter and is studying the giant planet's internal structure, among many other attributes.

Tomorrow's picture: storm flashers

Claes Wallin (韋嘉誠), Stephen Sekula likes this.

Claes Wallin (韋嘉誠), Stephen Sekula shared this.

In ~200 years, big things (expanded things) will happen there... you'll see! =)

JanKusanagi @i at 2017-05-15T13:33:57Z