La NASA a annoncé début septembre 2025 avoir détecté sur Mars ce qu’elle décrit comme les signes de vie les plus prometteurs à ce jour sur la planète rouge . Cette révélation fait suite à l’analyse approfondie d’un échantillon de roche prélevé en juillet 2024 par le rover Perseverance dans le cratère Jezero – le […]
Perseids 2025: how to make the most of it + my RTS interview
Every summer, astronomy enthusiasts and the curious alike marvel at a celestial spectacle: the Perseid shower of shooting stars. In 2025, conditions promise a particularly impressive show, with a peak expected on a near-perfect night. Whether you're a casual observer or an enthusiast with your own camera, here's everything you need to know [...]
Introduction: the harmonic mount revolution Strain wave mounts have recently revolutionized the world of astrophotography. Their promise? An exceptional load/weight ratio and the ability to dispense with counterweights, all with unrivalled compactness... Clearly, the itinerant astrophotographer can now take [...]
The Askar FRA600 astrograph is an apochromatic refractor with 108 mm aperture and 600 mm focal length (f/5.6). This Petzval quintuplet integrates a front triplet and a rear doublet (including 2 ED lenses), ensuring a flat field of 66 mm in diameter without additional correctors. The FRA600 is distinguished by its sturdy 4.2" Crayford rack-and-pinion eyepiece holder with [...].
Introduction The Moon has fascinated mankind since the dawn of time. Visible to the naked eye as the brightest star in the night sky, it has long been the stuff of legend and curiosity. However, it wasn't until 1609 that Galileo first observed the Moon's contours using an astronomical telescope. Since then, the Moon has never ceased to be [...]
The best places for stargazing in Switzerland Introduction Switzerland offers unique conditions for stargazing, combining sumptuous tourist landscapes with relatively unspoilt skies. Thanks to its high mountains and remote regions, the country ranks among the best astronomical sites in Central Europe. At altitude, [...]
When you're a beginner choosing a telescope, the optical jargon can seem intimidating. Should you opt for high "magnification"? A large "diameter"? A long focal length? Am I supposed to care about the f/d ratio? Don't panic, let's untangle these fundamental notions of telescope optics together. In this article, we're going to [...]
Published May 10, 2025 - updated regularly Choosing your first telescope: an ultra-complete beginner's guide 2025 1. Why invest in a telescope? Becoming an amateur astronomer means opening a window on the Universe: lunar craters, the phases of Venus, the rings of Saturn, distant galaxies... all accessible from your garden or balcony. Astronomy also offers many [...]
How to choose an eyepiece for your telescope? Choosing the right eyepieces is essential to getting the most out of your telescope. This guide explains what an eyepiece is and its role in the optical chain, how its focal length determines magnification, the importance of the apparent and real field of view, the differences between 1.25" and 2" formats, [...].
