In the vast expanse of the cosmos, where the stars twinkle and the galaxies dance, there is a story that transcends time and space. It is a tale of human curiosity, the relentless pursuit of knowledge, and the eternal struggle against obscurantism. This is the story of astronomy, a journey through the ages that reveals the beauty and complexity of the universe, and the forces that seek to shroud it in darkness. As an astronomer, I find myself drawn to this narrative, for it is a story that resonates deeply with my own passion for understanding the cosmos. It is a story that demands to be told, and I am honored to share it with you.
The history of astronomy is a testament to the power of human ingenuity and the indomitable spirit of inquiry. From the ancient civilizations of Mesopotamia and Greece to the modern era, astronomers have pushed the boundaries of knowledge, seeking to unravel the mysteries of the heavens. But with each step forward, they have also encountered resistance, for the quest for truth often challenges the status quo and the prevailing dogmas. This is the story of Galileo, Copernicus, and Bruno, who dared to question the established order and pay a heavy price for their audacity.
In the fertile plains of Mesopotamia, the Sumerians, Babylonians, and Assyrians lifted their eyes to the sky, observing and recording the movements of the heavens. They compiled the earliest records of celestial events, such as the movements of Venus and lunar eclipses, and built observatories in the form of ziggurats. The priest-astronomers were the intermediaries between the gods and mankind, deciphering the messages of the sky. This was the beginning of a long march, a journey that would take us from the ancient world to the modern era, and beyond.
In Greece, the Ionian thinkers, such as Thales, Anaximander, and Anaxagoras, took a bold step forward. They sought to understand the natural causes of the heavens, without resorting to the gods. Anaxagoras, in particular, dared to say that the Sun was not a god, but an incandescent stone. This was the first trial in the history of astronomy, and it would not be the last. The Ionians were followed by the medieval astronomers of the Arab-Muslim world, who translated the works of Ptolemy, built observatories, and refined astronomical tables. Words like 'algebra', 'zenith', 'nadir', 'Betelgeuse', and 'Aldebaran' come to us from this brilliant age.
In Europe, the rediscovery of Greek and Arabic texts in the twelfth century sparked a renewed interest in astronomy. Thomas Aquinas attempted a synthesis between Aristotle and Christianity, and universities were established in Bologna, Paris, and Oxford. But obscurantism kept watch, and in 1277, the Bishop of Paris condemned two hundred and nineteen philosophical propositions, several of which touched upon astronomy. Thought was under surveillance, and the quest for knowledge was not yet free from the shackles of ignorance and fear.
The Renaissance brought a new era of discovery, with Copernicus, a Polish canon, publishing his 'De revolutionibus orbium coelestium' in 1543. In this work, he set the Earth in motion, placing the Sun at the centre of the solar system. But he did so with prudence, knowing the scandal it would provoke. He died the very year of its publication, and Giordano Bruno, a Dominican monk and philosopher, took up Copernican ideas and pushed them further. He imagined an infinite universe, populated by an infinity of inhabited worlds. This was too much for the Church, and he was arrested, tried, and burned alive on February 17, 1600, on the Campo de' Fiori in Rome. Legend has it that he replied to his judges: 'You feel more fear in pronouncing my sentence than I do in enduring it.'
And then came Galileo, the father of modern science. He pointed a telescope at the sky and saw the mountains of the Moon, the phases of Venus, the satellites of Jupiter, and sunspots. He brought proof that the cosmos was not perfect, that the Earth was not the centre, and that the universe did not revolve around us. The Church summoned him, and the trial of 1633 is one of the darkest moments in the history of thought. He was threatened with torture, forced to recant, and placed under house arrest until his death. Legend has it that he murmured, as he left the court: 'Eppur si muove' ('And yet it moves').
This is what obscurantism does. It burns, it threatens, it gags. It cannot bear for the universe to be larger than its dogmas. But the lantern of knowledge always finds a way to shine through. Truth is stubborn, patient, and needs no violence to triumph. It needs witnesses, watchmen, and citizens who refuse to be silent.
In our own time, we see the same mechanisms at work. The Trumpist movement, with its blend of populism, nationalism, and hatred of intellectual elites, bears an uncanny resemblance to the forces that lit the pyre of Giordano Bruno. They no longer burn bodies, but they burn research budgets, censor climate reports, and appoint oil lobbyists to head scientific agencies. They create their own reality, populated by 'alternative facts', where truth is whatever the leader says it is. But the lantern of knowledge is still flickering, and it is up to us to protect it, pass it on, and keep the light shining.
