Europa,+Callisto,+Ganymede+(Jupiter)

=** Europa, Callisto, Ganymede (Jupiter) **= =** Casey So **=

Orbital period
==== Three of the moons influence each other in an interesting way. Io is in a tug-of-war with Ganymede and Europa, and Europa's orbital period (time to go around Jupiter once) is twice Io's period, and Ganymede's period is twice that of Europa. In other words, every time Ganymede goes around Jupiter once, Europa makes two orbits and Io makes four orbits. The moons all keep the same face towards Jupiter as they orbit, meaning that each moon turns once on its axis for every orbit around Jupiter. ====

History
Jupiter's moons which are Europa, Callisto and Ganymede are known as the Galilean moons. Galileo Galilei found only 3 moons at that time during the 1610 and thought that it was other planets orbiting around the solar system. However it was found that the moons were orbiting Jupiter and the fact that there was 4 moons orbiting Jupiter. The name of the 4th moon was called the lo.

Size
Europa Radius (km) 1560.8 Ganymede (km) 2631.2 Callisto (km) 2410.3

Resources
Europa is an ivory, gray, and brown moon with a water ice surface. Some areas in Europa has a high density of fractures where in some other areas there are less of these features. Also there has been water found in this moon therefore scientists are thinking that there could be a chance of life that exists on this moon. These factors could have created a biological environment for life that could possibly exist.

Significant & noteworthy features
There could be life on the moons of jupiter because water does exist in this moon therefore it gives us a hint that there could be life.

What don't we know
We are not sure if there is any life that exists on this moon and scientists are trying to find out if there is life on this planet or not.

Further plans or expeditions
There could be more investigation in the Galilean moons because there could possibly have life existing.

Work Cited
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