This fact was discovered in Europe only in the 17th Century, by Galileo, using one of the earliest optical telescopes to observe the moons of Jupiter.
(This fact; was discovered; L:in Europe; T:only in the 17th Century; by Galileo; using one of the earliest optical telescopes)
This fact
was discovered
L:in Europe T:only in the 17th Century by Galileo using one of the earliest optical telescopes