Under the Martinborough Stars
“Small pieces of glass”
By Becky Bateman
Around 1610, a middle-aged man gazed up at the heavens with a new-fangled piece of equipment up to his eye. What he saw, no one had ever seen before and led to a whole new way of thinking about our Solar System.
That man was Galileo Galilei, and the new-fangled equipment was a simple telescope. He was gazing at the planet Jupiter, the largest of the Solar System planets. He noticed Jupiter had seemingly small bright points of light on either side that moved around the planet regularly over time.
Galileo had found the first objects to orbit another planet and began the revolution that showed the Universe wasn’t quite what we had thought. Galileo turned the scientific and religious beliefs of the age upside down.
Poor Galileo was rather controversial in his time and spent most of the rest of his life under house arrest, questioned by the Spanish Inquisition and called a heretic.
The “points of light” on either side of Jupiter are now, in his honour, known as the Galilean moons: Io, Europa, Callisto and Ganymede.
These Galilean Moons are the four largest moons of Jupiter, and you can see them easily with binoculars or a small telescope. Ganymede is the largest moon in the whole Solar System, and even larger than the planet Mercury. … Continue Reading
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