Media Information
 
 
 
Collection:
NASA Astronomy Picture of the Day Collection
Title:
Jupiter, Europa, and Callisto
Explanation:
As the robot Cassini spacecraft [ http://www.jpl.nasa…] rounds Jupiter [ http://www.jpl.nasa…] on its way toward Saturn [ http://www.seds.org…], it has taken a sequence of images [ http://ciclops.lpl.…] of the gas giant with its four largest moons [ http://antwrp.gsfc.…]. Previously released images have highlighted Ganymede [ http://antwrp.gsfc.…] and Io [ http://antwrp.gsfc.…]. Pictured above [ http://photojournal…] are the two remaining Galilean satellites [ http://www.jpl.nasa…]: Europa [ http://www.hawastso…] and Callisto [ http://cass.jsc.nas…]. Europa [ http://www.jpl.nasa…] is the bright moon superposed near Jupiter's Great Red Spot [ http://antwrp.gsfc.…], while Callisto is the dark moon near the frame edge. Callisto [ http://www.jpl.nasa…] is so dark that it would be hard to see here if its brightness was not digitally enhanced. Recent evidence indicates [ http://www.jpl.nasa…] that both moons hold salt-water seas under surface ice that might be home to extra-terrestrial life. By noting the times that moons disappeared and reappeared behind Jupiter in 1676, Ole Roemer [ http://es.rice.edu/…] was able to make the first accurate estimation of the speed of light [ http://www.stats.uw…].
Credit and Copyright:
Cassini Imaging Team [ http://ciclops.lpl.…], Cassini Project [ http://www.jpl.nasa…], NASA [ http://www.nasa.gov/]
keyword:
Jupiter
keyword:
Europa
keyword:
Callisto
facet_when:
1676
facet_where:
Ganymede
facet_where:
Arizona
facet_where:
Saturn
facet_where:
Jupiter
facet_where:
Europa
facet_where:
Callisto
facet_where:
Goddard Space Flight Center (GSFC)
facet_where:
Jet Propulsion Laboratory (JPL)
facet_where:
Johnson Space Center (JSC)
facet_what:
Galileo
facet_what:
Ganymede
facet_what:
Moon
facet_what:
Saturn
facet_what:
Cassini
facet_what:
Jupiter
facet_what:
Io
facet_what:
Europa
facet_what:
Callisto
facet_when_year:
1676
original url:
http://antwrp.gsfc.…
UID:
SPD-APOD-ap010102

Jupiter, Europa, and Callisto
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