Alain Picard 
IN BRIEF Eclipse: the appearance of a celestial body when another celestial body positions itself in front of it. Solar eclipse: the Moon partially or completely blocks the light of the Sun. Lunar eclipse: the Earth is located between the Sun and the Moon, resulting in a shadow on the latter. Different types of eclipses: … Read more
IN BRIEF Lunar phases: a 29-day cycle with several stages. New Moon: absence of visible light, Moon positioned between the Earth and the Sun. First Quarter: right half of the Moon visible in the northern hemisphere. Full Moon: complete illumination of the surface, fully lit face. Last Quarter: left half visible, transition back to the … Read more
IN BRIEF Asteroids: monitored to assess the risks to Earth. Threats: encountering asteroids a kilometer in diameter can be fatal. Risks: about one threatening asteroid strikes Earth every 600,000 years. Dinosaur extinction: the impact of an asteroid 65 million years ago caused a mass extinction. NASA: regularly observes near-Earth objects and their potential danger. Opportunities: … Read more
IN BRIEF History of comets since antiquity. Notable discoveries of comets and their movements. Recent developments thanks to the Rosetta probe. Scientific challenges related to the formation of comets. Accessible and informative writing style. Impact of comets on modern astronomy. Comets, these mysterious celestial bodies, have fascinated humanity since antiquity with their spectacular appearance and … Read more
IN SHORT Antiquity : Origins of astronomy with the Mesopotamians and the Greeks. 1543 : Nicholas Copernicus proposes the heliocentric model. 17th century : Establishment of the law of gravitation by Isaac Newton. 20th century : Emergence of the Big Bang theory. Contributions from great astronomers like Galileo and Kepler. Evolution of observation instruments and … Read more
The spectacular advances in the field of numerical simulations now allow for an in-depth exploration of the complexity of galaxies and their evolution within the universe. The computational models developed by international teams, utilizing cutting-edge supercomputers, offer a unique window into star formation, galactic dynamics, and the gravitational effects of dark matter. This computer modeling … Read more
Artificial intelligence is revolutionizing contemporary astrophysics by providing powerful tools to analyze and classify a massive volume of astronomical data. Thanks to major advances in the fields of machine learning and deep learning, traditional methods of stellar classification, once tedious and limited, are gaining speed and accuracy. This technological turning point is propelled by the … Read more
In the ever-expanding universe of modern astronomy, managing and analyzing the colossal volumes of data collected has become a major challenge. These astronomical data, accumulated over decades, constitute the astronomical archives, true treasure troves of information about the evolution of the cosmos, celestial phenomena, and the mysteries of the Universe. The emergence of big data … Read more
Technological advancements and the democratization of the internet have facilitated the rise of a new form of scientific research: participatory science, where passionate citizens play an essential role. In astronomy, a field of observation and exploration often perceived as elitist, this openness profoundly transforms modes of participation and investigation. From simple amateur astronomical observation to … Read more
In the vast field of modern astronomy, the characterization of exoplanetary atmospheres emerges as a cutting-edge discipline, opening new perspectives on understanding worlds beyond our solar system. The precise study of these gaseous envelopes reveals much more than their existence: it offers a window into the chemical composition, atmospheric dynamics, and the physico-chemical processes that … Read more