[DOC] [TLE] moons of Jupiter - Wikipedia [PAR] The Galilean moons are the four largest moons of JupiterIo, Europa, 
Ganymede, and Callisto. They were discovered by Galileo Galilei around 
January 1610 and were the ... Galileo initially named his discovery the Cosmica 
Sidera ("Cosimo's stars"), but the names that eventually prevailed were .... (g/cm)
, Semi-major axis [DOC] [TLE] Jupiter - Moons | Planets - NASA Solar System Exploration [PAR] The planet Jupiter's four largest moons are called the Galilean satellites after 
Italian astronomer Galileo Galilei, who first observed them in 1610. ... but he did 
not publish his observations and so Galileo is given the credit for their discovery. 
... Galileo spacecraft made observations from repeated elliptical orbits around 
Jupiter,... [DOC] [TLE] Jupiter's Moons: Facts About the Largest Jovian Moons - Space.com [PAR] Jul 5, 2012 ... Jupiter's Moons: Facts About the Largest Jovian Moons ... passages of Galileo 
Galilei's journal detailing his discovery of four moons orbiting Jupiter. ... In 
January 1610, Italian astronomer Galileo Galilei discovered four of Jupiter's ... are 
closer to the planet and provide the dust that make up Jupiter's rings. [DOC] [TLE] The Galilean Moons of Jupiter [PAR] Jupiter's 4 largest moons exhibit some of the most interesting geology in the solar 
... They were discovered by Galileo Galilei and are known as the Galilean moons. 
... Europa's surface and crust are made almost entirely of water ice, and its... [DOC] [TLE] What are the Galilean Moons? - Universe Today [PAR] Apr 26, 2016 ... Jupiter's largest moons are known as the Galileans, all of which were discovered 
by Galileo Galilei and named in his honor. ... The Galileans take their name from 
Galileo Galilee, the famous Italian astronomer who discovered them ... to have 
found these four moons  prescribed the names Io, Europa,... [DOC] [TLE] JUPITER'S Moons - EnchantedLearning.com [PAR] Galileo first discovered the four largest moons of Jupiter, Io, Europa, Ganymede, 
... Io, Europa, Ganymede (the biggest), Callisto (the second biggest), Leda (the 
smallest), ... Io was discovered by Galileo and Marius (independently) in 1610. ... 
His calculations put the speed of light at about 225,000 kilometers per second (it 
is... [DOC] [TLE] The Galileo Project | Science | Satellites of Jupiter [PAR] Of these, four are comparable to the Earth's Moon in size; the rest are orders of ... 
At the end of 1609, as he was finishing his series of observations of the Moon, 
Jupiter was at ... off the press in Venice in the middle of March 1610 and made 
Galileo famous. ... In 1655 Huygens discovered the first and largest; then in 1671-
72... [DOC] [TLE] When Did Galileo Discover Jupiter? - Biography - YourDictionary [PAR] He made significant contributions to the field of astronomy, such as designing 
improvements to the telescope and detailing extensive notes recording his 
observations. ... He was also the first astronomer to discover the four largest 
moons that orbit ... On January 10, 1610 Galileo discovered another one of 
Jupiter's moons. [DOC] [TLE] Callisto: Facts about Jupiter's Moon, Callisto  The Planets [PAR] Callisto is the eighth moon of Jupiter and the second largest of the planet's 
known ... is the outermost of the Galilean moons  the four largest moons of 
Jupiter: Io, Europa, Ganymede and Callisto  discovered by Italian scientist 
Galileo in 1610. ... His wife Hera then changed her into a bear before Zeus 
transformed her into a... [DOC] [TLE] Galileo Galilei - Facts & Summary - HISTORY.com [PAR] His flair for self-promotion earned him powerful friends among Italy's ruling elite 
and ... In 1583 he made his first important discovery, describing the rules that ... 
From 1589 to 1610, Galileo was chair of mathematics at the universities of Pisa ... 
he discovered four new stars orbiting Jupiterthe planet's four largest moons. [DOC] [TLE] What did Galileo discover about Jupiter? | Reference.com [PAR] Galileo is credited with discovering the first four moons of Jupiter, now known as 
the ... NASA Solar

Question: In 1610 this Italian made his biggest discovery: the 4 largest moons of Jupiter
Answer: Galileo