He used the telescope that he invented to observe Jupiter moons orbiting something other than earth?

Answer 1

Galileo

Answer 2

Ok, I can't help chuckling a little on this question.
Of COURSE Jupiter moons orbit something other than the earth! They orbit Jupiter :)
Galileo was the first to use a telescope to explore the 'heavenly bodies' - and as a result, was persecuted by the church for introducing 'heretic ideas'.
Anyway, Galileo discovered the 4 largest of Jupiter's moons, and as of today, there are 60 known moons orbiting Jupiter. It is believed there may be several more, and information keeps coming in.

Answer 3

Galileo Galilei (15 February 1564 – 8 January 1642) was an Italian physicist, astronomer, astrologer, and philosopher who is closely associated with the scientific revolution. His achievements include the first systematic studies of uniformly accelerated motion, improvements to the telescope, a variety of astronomical observations, and support for Copernicanism.
Based only on sketchy descriptions of the telescope, invented in the Netherlands in 1608, during that same year Galileo Galilei made one with about 3x magnification, and later made others with up to about 32x magnification. With this improved device he could see magnified, upright images on the earth - it was what is now known as a terrestrial telescope, or spyglass. He could also could use it to observe the sky; for a time he was one of very few who could construct telescopes good enough for that purpose. On August 25, 1609, he demonstrated his first telescope to Venetian lawmakers. His work on the device made for a profitable sideline with merchants who found it useful for their shipping businesses. He published his initial telescopic astronomical observations in March 1610 in a short treatise entitled Sidereus Nuncius (Starry Messenger).


It was on this page that Galileo first noted an observation of the moons of Jupiter. This observation upset the notion that all celestial bodies must revolve around the Earth. Galileo published a full description in Sidereus Nuncius in March 1610.In the week of January 7, 1610 Galileo discovered three of Jupiter's four largest satellites (moons): Io, Europa, and Callisto. He discovered Ganymede four nights later. He noted that the moons would appear and disappear periodically, an observation which he attributed to their movement behind Jupiter, and concluded that they were orbiting the planet. He made additional observations of them in 1620. Later astronomers overruled Galileo's naming of these objects, changing his originally named Medicean stars (after his patrons, the Medici) to Galilean satellites. The demonstration that a planet had smaller planets orbiting it was problematic for the orderly, comprehensive picture of the geocentric model of the universe, in which everything circled around the Earth.

Answer 4

Galileo. No question. :)