Mysterious Features on Ganymede

COLLECTION NAME:

NASA Astronomy Picture of the Day Collection

mediaCollectionId

NVA2~4~4

NASA Astronomy Picture of the Day Collection

Collection

true

Title:

Mysterious Features on Ganymede

title

Mysterious Features on Ganymede

Title

false

Explanation:

Where is the rest of the circle? Jupiter [ http://www.seds.org… ]'s largest moon Ganymede [ http://bang.lanl.go… ] has some truly unusual terrain, including the pictured half circle above [ http://galileo.ivv.… ] cut by nearly parallel curves. Full circles can be easily explained by impact craters [ http://antwrp.gsfc.… ], but partial circles imply that some resurfacing [ http://galileo.ivv.… ] has occurred since the original impact. The diameter of the half circle is about 32 kilometers. Also of interest is a dense linear crater chain [ http://antwrp.gsfc.… ] that cuts across the top of the half-circle. Mysteries like these are typically solved by the hard work of reconstructing a sequence of natural occurrences, which in this case may yield a better understanding of Ganymede [ http://galileo.ivv.… ]'s interesting past.

explanation

Where is the rest of the circle? Jupiter [ http://www.seds.org/nineplanets/nineplanets/jupiter.html ]'s largest moon Ganymede [ http://bang.lanl.gov/solarsys/ganymede.htm ] has some truly unusual terrain, including the pictured half circle above [ http://galileo.ivv.nasa.gov/ganymede/PIA01087.html ] cut by nearly parallel curves. Full circles can be easily explained by impact craters [ http://antwrp.gsfc.nasa.gov/apod/ap971117.html ], but partial circles imply that some resurfacing [ http://galileo.ivv.nasa.gov/ganymede/PIA01089.html ] has occurred since the original impact. The diameter of the half circle is about 32 kilometers. Also of interest is a dense linear crater chain [ http://antwrp.gsfc.nasa.gov/apod/ap950715.html ] that cuts across the top of the half-circle. Mysteries like these are typically solved by the hard work of reconstructing a sequence of natural occurrences, which in this case may yield a better understanding of Ganymede [ http://galileo.ivv.nasa.gov/ganymede/ ]'s interesting past.

Explanation

false

Credit and Copyright:

The Galileo Project [ http://galileo.ivv.… ], NASA [ http://www.nasa.gov/ ]

credit_and_copyright

The Galileo Project [ http://galileo.ivv.nasa.gov/ ], NASA [ http://www.nasa.gov/ ]

Credit and Copyright

false

keyword:

camera

keyword

camera

keyword

false

facet_where:

Ganymede

facet_where

Ganymede

facet_where

false

facet_what:

Crater

facet_what

Crater

facet_what

false

original url:

http://antwrp.gsfc.…

original_url

http://antwrp.gsfc.nasa.gov/apod/ap971209.html

original url

false

UID:

SPD-APOD-ap971209

uid

SPD-APOD-ap971209

UID

false

MEDIA INFORMATION

Mysterious Features on Ganymede