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Albert Einstein once remarked that Galileo Galilei's contributions signify the true start of physics. His work revolutionized astronomy as well; Galileo was the first to turn a telescope towards the stars, and his findings reshaped our understanding of the universe. Here are 15 fascinating facts you may not know about the father of modern science.
1. The reason Galileo Galilei’s first name mirrors his last name is not coincidental.
You may have noticed that Galileo Galilei’s first name is strikingly similar to his family name. In her book Galileo’s Daughter, Dava Sobel explains that in Galileo’s native Tuscany, it was a common tradition to give the first-born son a Christian name derived from the family surname (in this case, Galilei). Over time, the first name became dominant, and today we remember the scientist simply as “Galileo.”
2. Galileo Galilei likely never dropped anything from the Leaning Tower of Pisa.
Due to its iconic tilt, the Leaning Tower of Pisa, where Galileo spent his formative years, would have been an ideal spot to test his theories of motion, particularly regarding falling objects. Did Galileo really drop items of various weights to observe which would hit the ground first? Unfortunately, we only have one written account of such an experiment, recorded many years after the event. Historians speculate that if Galileo had conducted this spectacle, there would have been more evidence. (However, physicist Steve Shore did conduct the experiment at the tower in 2009, and I captured it on video and uploaded the results on YouTube.)
3. Galileo instructed his students in the art of casting horoscopes.
It may seem odd to imagine the father of modern science involved in astrology. However, two things must be kept in mind: First, as historians point out, it’s unfair to judge the past by today’s standards. While we know that astrology is not scientifically valid, in Galileo’s time, it was still closely connected to astronomy. Furthermore, Galileo wasn’t wealthy—teaching astrology would have made him a more sought-after professor.
4. Galileo wasn’t fond of being told what to do.
You might already know this, especially considering his later conflict with the Roman Catholic Church. But even as a young professor at the University of Pisa, Galileo was known for challenging authority. The university had strict rules that required him to wear formal robes at all times. Galileo refused, finding the robes pretentious and the bulky gown a hindrance. As a result, the university cut his salary.
5. Galileo Galilei didn’t invent the telescope.
While the true inventor is unclear, a Dutch spectacle-maker named Hans Lipperhey is often credited with the invention (he applied for a patent in the fall of 1608). Within a year, Galileo Galilei acquired one of these Dutch-made devices and quickly improved its design. Before long, he had a telescope that could magnify objects 20 or even 30 times. As science historian Owen Gingerich put it, Galileo transformed “a popular carnival toy into a scientific instrument.”
6. A king pressured Galileo to name planets after him.
Galileo gained widespread fame in 1610 after discovering, among other things, that the planet Jupiter was accompanied by four moons, previously unseen and invisible without a telescope. Galileo named them the “Medicean stars” in honor of his patron, Cosimo II of the Medici family, ruler of Tuscany. News of the discovery spread quickly, and soon the King of France was asking Galileo to name other worlds after him.
7. Galileo didn’t face conflict with the church for the first two-thirds of his life.
In fact, the Vatican was eager to acquire astronomical knowledge, as it was essential for determining the dates of Easter and other holidays. In 1611, when Galileo visited Rome to demonstrate his telescope to the Jesuit astronomers, he was warmly received. The future Pope Urban VIII even had one of Galileo’s essays read aloud at dinner and wrote a poem in praise of him. It wasn’t until later, when a few disgruntled conservative professors started criticizing Galileo, that things began to take a turn for the worse. The situation worsened in 1616 when the Vatican officially condemned the heliocentric system proposed by Copernicus, which Galileo’s observations supported. However, the issue wasn’t with Copernicanism itself, but rather the idea of a moving Earth, which seemed to contradict certain passages in the Bible.
8. Galileo likely could have made a living as an artist.
Though we typically think of Galileo as a scientist, his interests and talents spanned multiple fields. Galileo was an accomplished artist, able to draw and paint as well as many of his contemporaries, and he was particularly skilled in perspective—a talent that likely helped him interpret the astronomical wonders he observed through his telescope. His lunar sketches are especially notable. As art historian Samuel Edgerton put it, Galileo’s work displays “the deft brushstrokes of a practiced watercolorist,” with images that have a “soft, luminescent quality.” Edgerton even notes Galileo’s “almost impressionistic technique,” over two centuries before the rise of Impressionism.
10. Galileo explored the concept of relativity long before Einstein.
He didn’t write about the same kind of relativity as Einstein, but Galileo clearly understood that motion is relative—that is, your perception of motion depends not only on the object you observe but also on your own movement. For example, if you were confined to a windowless cabin aboard a ship, you wouldn’t be able to tell if the ship was stationary or moving at a constant speed. Over 250 years later, these ideas would become essential to the young Einstein’s thinking.
10. Galileo never married, but that doesn’t mean he was without companionship.
Galileo had a close relationship with a beautiful woman from Venice named Marina Gamba, with whom he had two daughters and a son. Despite this, they never married or even lived together. Why? As Dava Sobel points out, it was common for scholars of the time to remain single, and differences in social class may have also played a part.
11. You can listen to music composed by Galileo’s father.
Galileo’s father, Vincenzo, was a professional musician and music teacher. Several of his compositions have survived, and you can find modern recordings of them on CD (like this one). Galileo learned to play the lute under his father’s guidance and became a skilled musician in his own right. His musical ability may have even helped in his scientific endeavors. Without precise clocks, Galileo was still able to measure the time it took for objects to roll and fall to within fractions of a second.
12. Galileo’s discoveries may have inspired a scene in one of Shakespeare’s later plays.
An interesting tidbit is that Galileo and Shakespeare were born in the same year (1564). By the time Galileo turned his telescope to the night sky, however, the famous playwright was nearing the end of his career. But Shakespeare wasn’t quite done yet: His final play, Cymbeline, contains what might be a reference to one of Galileo’s most remarkable findings—the four moons orbiting Jupiter. In the play’s last act, the god Jupiter descends from the sky, surrounded by four ghosts dancing in a circle. This could be a mere coincidence—or, as I suggest in my book The Science of Shakespeare, it might hint at the Bard’s awareness of one of the great scientific breakthroughs of his time.
13. Galileo received some notable visitors during his house arrest.
Accused of “vehement suspicion of heresy,” Galileo spent the last eight years of his life under house arrest in his villa near Florence. Despite his confinement, he continued writing and, seemingly, entertained guests, including two prominent English figures: the poet John Milton and philosopher Thomas Hobbes.
14. Galileo’s remains haven’t rested in peace.
When Galileo passed away in 1642, the Vatican denied him a resting place alongside his family at Florence’s Santa Croce Basilica. Instead, his remains were placed in a small side chapel. However, a century later, his reputation had grown, and his bones (with a few fingers missing) were relocated to their current resting place beneath an impressive tomb in the basilica’s main chapel. Nearby, the work of Michelangelo stands.
15. Galileo likely wasn’t pleased with the Vatican's 1992 “apology.”
In 1992, under Pope John Paul II, the Vatican officially acknowledged its error in persecuting Galileo. However, the apology seemed to shift much of the blame onto the clerks and theological advisers involved in his trial, rather than on Pope Urban VIII, who had overseen the proceedings. Furthermore, the heresy charge was not rescinded.
Additional sources: The Discoveries and Opinions of Galileo; Galileo's Daughter; The Cambridge Companion to Galileo.
